Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
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Cinctus Adjustable Nylon Band for Fitbit Air

Cinctus Adjustable Nylon Band for Fitbit Air

Regular price $59.99
Regular price $119.99 Sale price $59.99 Save $60.00

In Stock - Free Shipping Activated

Band Colour: Deep Blue
Band Width: Fitbit Air

BLACK FRIDAY: 60% OFF EVERYTHING 

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  • Free Shipping
  • Easy Returns
  • 100 Days Guarantee

Wrist or arm, you decide. The Cinctus gives you the flexibility to wear your Fitbit Air as a traditional wristband or move it to your bicep for more accurate heart rate tracking during lifting, cycling, or any exercise where wrist placement gets in the way.

Features:

  • Dual Wear Design works as wristband or armband
  • Premium Lightweight Nylon feels soft and breathable
  • Adjustable Stainless Steel Clasp provides customizable, secure fit
  • Quick-Dry Material recovers fast after sweat and moisture
  • Slim Profile stays streamlined without bulk
  • Sweat- and Wear-Resistant handles intense activity
  • Soft Woven Texture feels comfortable against skin
  • Durable Construction withstands daily use and workouts
  • Available in 8 Colours to suit your personal and unique style

Details & Compatibility:

  • Fits Wrist Size:
    • 175mm - 260mm (6.9" - 10.2")
  • Fits Arm Size:
    • 250mm - 400mm (9.8" - 15.75")
  • Compatible With: Fitbit Air

Shipping and returns

Shipping

We offer FREE Tracked shipping on all orders! 📦

We offer Shipping to the United States, Canada, United Kingdom, Australia and New Zealand

We process orders between Monday and Friday. Please note that we require 2 to 3 working days on average to fulfill your order before dispatching it. Rest-assured we are doing everything in our power to get your order to you as soon as possible!

Once your order is dispatched, depending on your country or region, estimated delivery time is between 5 to 10 business days. Please consider any holidays or global events that might impact delivery times.

Returns

We offer hassle-free returns to our nearest dispatch center. To start a return just contact our support team at support@astrastraps.ca and we will make the process easy and effortless.

PLEASE NOTE: Due to delays caused by huge pressure on international and local shipping companies, orders may be delayed for arrival. 

Our guarantee

The Astra Standard
Engineered for quality. Protected by our guarantee.
Premium Build
Rigorous QC checks ensure every strap meets the highest tier of durability.
100-Days Guarantee
Full coverage against defects, Faults. 
Insured Shipping
Free tracked shipping on all orders. Transit protection included.

Size guide


At Astra Straps, all our straps have specific and clear sizes indicated. Please check the sizing guide below before ordering. If you are still unsure, you may contact us here.

1. How do I know my wrist size?

Simply use a flexible measuring tape to wrap around your wrist and record the measurement on the tape that overlaps the zero end of the tape OR just grab any string/paper strips to do the same, then lay the string on a ruler to get your accurate wrist size.

In most cases, knowing your wrist size/length will be sufficient. Check your wrist size against the size of the strap that you wish to purchase on the individual product details page.

From there, you can select and purchase our watch straps: Small (S), Large (L) or Free Size.

2. What is the watch band width / watch lug measurement?


In certain cases, knowing your wrist size alone may not be sufficient. In such a scenario, you will need the watches' band width size, also know as the watch lug width size.

Your Apple watch will say the measurement on the back.

If you cant find the size on the back place the watch with the watch face facing up. Take the measurement of the distance between the lugs (where the watch strap fits).

For Apple Watches the you have the choice between 38MM, 40MM, 41MM, 42MM, 44MM, 45MM & 49MM, you can also enter your watch model number into a search engine to find what size your watch uses.

Apple Watch 7, 8, and 9: The Apple Watch Series 7, 8, and the newly released Series 9 are compatible with a wide range of our bands, including sizes 38MM, 40MM, 41MM, 42MM, 44MM, 45MM, and 49MM. For watch cases, they fit the 41MM and 45MM sizes.

Apple Watch Ultra and Ultra 2: The recently introduced Apple Watch Ultra and Ultra 2 are compatible with 45MM and 49MM bands. As for the watch cases, both the Ultra and Ultra 2 models are available in a 49MM size.

Using these three measurement data points, you are now ready to grab your strap!

Ask a question

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Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps

Questions? We've Got Answers! ⭐

Real talk about your new favorite watch band

Will this actually fit my watch?

Absolutely! Whether you’re rocking the original Series 1 or the latest model, we’ve got you covered. Just check the size on the back of your watch (if you're not sure), and we'll handle the rest. It’s that easy.

What makes Astra Straps different?

Great question! At Astra Straps, we don’t just make bands – we craft them.

Every single band is hand-finished to ensure the highest quality and attention to detail. We’re all about combining top-notch materials with unique designs that reflect your personal style.

Plus, we test every band for comfort and durability, so you can count on a strap that’s as strong as it is stylish. When you choose Astra Straps, you’re not just getting a band – you’re getting a piece of wearable art.

Is it really comfortable, or just good-looking?

Why settle for one when you can have both? Our bands are designed to look amazing and feel just as great.

We’ve obsessed over comfort, so you don’t have to. No weird pinching or “I need to take this off” moments – just a band that feels as good as it looks.

Will it stand up to my crazy life?

We’ve put our bands through the wringer because we know you don’t have time to baby your watch.

Whether you're hitting the gym, caught in the rain, or dealing with your most accident-prone friend, these bands are built to last. Bring on the hustle!

How do I pick the right size?

Most people use a tape measure (or even just a string) to wrap around their wrist, then add half an inch. But don’t stress – most of our bands are super adjustable, so unless your wrists are tiny or extra large, the standard size should work just fine. Still not sure? Reach out to us, we’re here to help!

What if I don’t love it?

We get it – sometimes things just don’t work out. If you’re not in love within 100 days, send it back, no questions asked. We’ll refund you, no drama. We want you to have a band you absolutely love.

When will it get here?

We’re all about speed. Most orders ship within 1-2 days, and you can expect it to arrive shortly after.

And the best part? Shipping is free—because let’s be real, no one wants to pay extra for shipping.

Do I need to buy anything else?

Nope! We believe in keeping things simple. Everything you need is in the box. No sneaky extra fees or “must-have” connectors. Just open it, snap it on, and you’re good to go.

How do I keep it looking fresh?

Super easy! Silicone bands just need a quick rinse with soap and water. Leather ones? Just a gentle wipe down.

Metal ones can be cleaned with a soft cloth. And don’t worry – we’ll send you a full care guide, but these bands are pretty low maintenance.

  • 5 stars: 44 (90%)
  • 4 stars: 5 (10%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
K
Kaitlyn Brooks
My pick would be army green

I tend to wear earthy colours, and this shade fits right in. The woven pattern makes it look even better.

R
Rachel McLeod
Deep gray is underrated

The charcoal shade looks really refined in the close-up. I prefer it over black because you can see the texture more clearly.

K
Kayla F.
Olive green with black hardware

Such a good combination. The army green material and dark metal accents complement each other really well.

P
Paige D.
Great for a neutral wardrobe

I wear mostly black, gray and navy, so the colors in this collection are right up my alley.

S
Simon Charbonneau
The wine red is gorgeous

That dark red has so much more character than basic black. I love how it looks against the dark metal hardware.

S
Sydney Crawford
A smart-looking fitness accessory

The dark blue material has a subtle pattern that looks particularly good in the close-up product images.

D
Dominic A.
Really like the starlight shade

It's warmer than pure white, which makes it easier to pair with beige and cream outfits. Such a nice neutral.

A
Ariane Rousseau
WOAH, love that woven finish!!!

The tiny textured pattern is what sold me on the design. It looks so much nicer than a completely smooth band.

S
Shannon Reid
A band that doesn't scream gym

The design looks equally suitable for sitting at a desk or heading out for a run. That's what appeals to me.

O
Olivia Caron
The texture makes the difference

That woven-looking surface gives the band a much more interesting finish than a plain rubber strap. Army green is a great choice.

D
Dylan M.
Finally, a wider adjustment range

The size range is what caught my attention. Having room to adjust the band is important when I'm exercising.

A
Adele Fournier
Minimal but not boring

The weave adds depth, while the metal frame gives the whole band a more structured look. Nicely balanced design.

G
Gabrielle Poirier
Looks sharp with casual clothes

I really like the deep blue. It has a sporty appearance without looking like something meant only for the gym.

E
Evan Sinclair
That clasp design is clever

The rectangular metal adjuster gives it a clean finish. I like how the strap loops through instead of having a row of holes.

M
Megan L.
Army green all the way

This is the exact kind of muted green I like. Not too bright and not too brown. Looks fantastic with charcoal clothing.

M
Mathieu Boucher
A different kind of fitness band

The woven nylon and sliding clasp make this stand out from the usual silicone replacements. Nice change of style.

T
Tyler G.
Gym gear without the flashy colors

I like that these shades are mostly understated. My workout clothes are already colorful enough, so the black is ideal.

C
Cameron Ellis
Great-looking everyday option

The simple rectangular clasp and solid colors make this feel more versatile than a heavily patterned sport strap.

J
Jocelyn P.
Sizing details are helpful

I appreciate the stated range, although I'd still recommend measuring your wrist before ordering.

L
Lauren Whitaker
For people who prefer nylon

I like the idea of a woven band rather than something completely smooth. The adjustable construction is another plus.

C
Colin B.
Starlight looks classy

The warm cream tone is subtle and polished. It would pair beautifully with neutral clothing and a simple watch face.

N
Noemie Blais
The navy is perfect

Deep blue has that professional look I want for work but still feels appropriate for running or weekend activities.

T
Tristan Wallace
No unnecessary decorations

Just textured nylon, metal hardware and an adjustable loop. That's exactly the straightforward design I prefer.

E
Erica H.
Interesting clasp arrangement

I like how the strap threads through the metal frame. It looks more adjustable than a traditional fixed-hole band.

V
Vincent Lachance
Good color choices for men too

Army green, deep gray and navy are all solid options. I'd probably choose two and rotate them.

M
Madison Kerr
Not sure about white for workouts

The white looks really clean, but I'd be concerned about visible dirt after outdoor training. Dark blue is probably safer for me.

B
Blake R.
Looks great in the gym photos

The band has a rugged but tidy appearance. I especially like the way the dark metal frame contrasts with the navy material.

A
Annabelle Perreault
The subtle pattern is excellent

You don't notice the tiny woven pattern immediately, but up close it adds a lot of visual interest.

G
Gavin Johnston
Something different from silicone

I've been looking at alternative strap styles, and this textured nylon design is a refreshing change.

L
Louis Paquette
Adjustable without lots of holes

The continuous strap and slider arrangement is appealing. It looks neat and avoids the usual perforated-band appearance.

B
Brielle Morrison
A mature sporty look

Not every fitness accessory needs bright neon colors. The wine red and gray options have a much more understated feel.

O
Owen S.
Would like more size examples

The adjustable range is useful, but I'd love to see this modeled on both smaller and larger wrists for comparison.

L
Laurie Michaud
That blue is SO good!!!

The deep blue has a really rich tone. It's the first one I'd pick from this collection.

Why 100,000+ Customers Choose Astra Straps

390+ Styles. Premium quality. Prices that actually let you switch it up.

Endless

Style

Match every mood,
outfit, occasion

Premium

Materials

No cheap

plastic here

Built

To Last

Survives workouts, adventures, life

Perfect

Fit

Comfortable

from day one

100 Day

Warranty

We’ve got you covered for 100 days

  • “I recently got the Astra Apple Watch band and am very impressed with its quality and stunning design. Right from the packaging, it was clear this band was made with great care. The premium-grade silicone is soft against the skin, comfortable for all day wear, and durable enough for an active lifestyle. Im thrilled with my purchase."

  • “Don't waste money on expensive Apple bands. This one is stylish, fits well, and is excellently made. You can get several of these for the price of one official band."

  • “Ive had many Apple watch bands over the years, and this is the best, coolest, and most comfortable one yet. It makes the watch look extremely upscale. A friend paid much more for the same band elsewhere and couldn't believe my price. Highly recommended. Love!"

  • “Amazing quality, very flexible and not stiff like other straps. Doesn't have that cheap band smell. Highly recommend, and great to have the option to match the strap color with my style."

  • “I was looking for a band thats not only exceptionally comfy but also stylish and durable. These bands tick all those boxes. I appreciate the bands design where it tucks in neatly. My original band caught on everything, but this one has a much smoother design. I love it!"

  • “Astra Straps' customer service is top-notch. I had a question about sizing, and they responded promptly with helpful guidance. It's refreshing to see a company that values its customers."

  • “Astra Straps has been a game-changer for my watch collection! Their bands are not only stylish but incredibly durable. I've swapped out all my old bands for Astra and couldn't be happier."

  • “The watch bands fit perfectly around my wrist as there are plenty of holes to adjust to my wrist size. The colors are very nice. The feel of the band is smooth. The way the band clasps is a plus as it is very secure on my wrist."