Omega Seamaster Diver 300M
White
“Once you try one of their HydroFlex™ sailcloth straps, you may never want to wear anything
else.” -
4.9
|
by 350 customers
Verified Buyers
Vulcan Clay Edition
Brown Strap with Brown Stitching
Designed to match the precision of the watch it holds.
Sweat, saltwater, & dust resistant.
Zero break-in time - maximum comfort from day one.
$248.00
In stock ready to ship
Enjoy free and fast United States delivery
Ships from inside the United States. No tariffs.
We cover all import fees, VAT, & duties for all EU & UK customers.
Dimension & Specs
Thickness
Tapers from 5.4mm down to 2.2mmWidth taper:
- 18mm tapers down to 16mm at the clasp end.
- 19mm tapers down to 16mm at the clasp end.
- 20/16mm tapers down to 16mm at the clasp end.
- 20/18mm tapers down to 18mm at the clasp end.
- 21mm tapers down to 18mm at the clasp end.
- 22mm tapers down to 20mm at the clasp end.
- 23mm tapers down to 20mm at the clasp end.
Material:
HydroFlex™ dual stage vulcanised FKM rubberFully vegan and waterproof
Comes fitted with high quality stainless quick release spring bars
Can be paired with our Loop-Less™ Deployant Clasp (sold separately)
What is Loop-less™?
Loop-less™ is our renowned strap system designed for folding deployant clasps. You set your size once, then simply slip it on and click shut—no extra keepers, no loose ends. Common concerns are security and fit; Loop-less™ covers both:
- Effortless on-off. Slide your wrist in, snap the clasp, and go.
- No bulk. Enjoy a seamless profile under any cuff or sleeve.
- Lock-down confidence. Designed to stay in place through every move.
If you’ve ever battled excess strap loops or tangled keepers, Loop-less™ removes that hassle without compromising safety.
What is HydroFlex™?
HydroFlex™ is our flagship FKM-rubber compound, perfected over an eight-hour mixing process and dual-stage vulcanisation at extreme temperatures. Many ask if a high-performance rubber strap can be soft and durable; HydroFlex™ delivers both:
- Zero break-in. It feels supple from day one and never stiffens with wear.
- All-weather resilience. Saltwater, sweat, heat or cold will not compromise its form or function.
- Precision comfort. Curved to your wrist with an embossed finish that breathes and flexes like a fine bracelet.
If you’ve struggled with straps that crack, fade or pinch, HydroFlex™ solves those issues out of the box.
Endorsed by Industry Leaders.
”Artem’s Hydroflex is the best strap I’ve ever had the chance to sample.”
Jamie Weiss
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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FAQ’s
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Contact Us
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Keep It Only If It’s Perfect.
30-Day Fit & Feel Guarantee.
If the colour, fit, or look isn’t perfect, return the strap unworn within 30 days for a full refund or exchange.
2-Year Craftsmanship Warranty.
Covered for 24 months against cracks, delamination, or stitching faults. We’ll repair or replace the strap free of charge.
Our favourite watch pairings.
Tudor Black Bay 58
Brown White
Omega Seamaster
Cosmic Tide
Rolex GMT-Master II Pepsi
Dark Matter
Rolex Explorer II 16570
Lunar Ash
Tudor Pelagos 39
Blood Moon
Omega Speedmaster
Event Horizon
Omega Speedmaster
Solar Flare
Zenith Chronomaster Sport
Titan Dune
Zenith Chronomaster Sport
Orbital Moss
Longines Spirit Zulu Time
Vulcan Clay
Take it from our 30,000+ customers.
Matt H.
"Once it’s strapped on, the sizing is nice. It fits well."
SBGY011 Grand Seiko
Dark Matter
Chin Chuan C.
"It fits really nice and easy…Feels really comfortable right from the start."
Omega Aqua Terra
Blood Moon
Alexander K.
"The quality is excellent. It’s very comfortable."
Omega Seamaster 300m
Nova Light
Caio F.
"Super nice. Gives a whole other characteristic to the watch."
Chirstopher Ward
Dark Matter
Nicholas B.
"I tried this, and I’m really happy. It fits my existing Tag Heuer clasp perfectly."
Tag Heuer Monza Calibre 36
Nebula Dust
The HydroFlex ™ advantage
Compare
HydroFlex™
Others
Instant comfort. Zero "break-in" period
Resistant to cracking & fraying
Fully waterproof (pool & sea)
Customers often compare to OEM level fit & finish
Built for extreme use (i.e. snow, heat, UV, sweat, etc.)
Custom design based on 6+ years of R&D & feedback
Rebranded, copy/imitation strap from Ali Baba, Temu, Etc.
All-day comfort. Lighter, cleaner wrist profile. Built to endure.
Made possible by the Loop-less™ deployant system and dual-stage-vulcanized HydroFlex™ rubber.
Flawless fit. Zero readjustment.
The Loop-less™ clasp locks once for a precise, repeatable fit. no stretching or daily tightening.
Weightless movement, no pressure points.
HydroFlex™ rubber flexes with your wrist, keeping even comfort through every motion.
Endures what ordinary rubber can’t.
Dual-stage vulcanization keeps it flexible, salt-proof, and perfectly shaped for years.
Choose your perfect finish.
Every strap is designed for our precision-engineered deployant clasp, designed for comfort, durability, and integration. Available in classic stainless steel or stealth DLC-coated black.
Engineered comfort. Curved design ensures even pressure on the wrist.
Luxury finish. Brushed surfaces resist scratches and match high-end cases.
Custom feel. Easy to swap and size for your exact preference.
See it on 30,000+ wrists.
"The comfort, luxury feel, durability, and craftsmanship are all truly impressive."
Jaehong K.
Event Horizon Edition
"Let me tell you: incredible strap! Expensive, yes. But man is it quality and super stylish!"
Andrew H.
Solar Flare Edition
"In my opinion, the Loopless Hydroflex Strap is so comfortable I can wear it for days, forgetting I'm wearing it."
Michael A.
Orbital Moss Edition
"Simply one of the best watch straps! They feel smooth, looks elegant and wears very well."
Matthias L.
Titan Dune Edition
"Good quality, Very comfortable. Highly recommended."
Ryan L.
Nova Light Edition
"If you are on the edge about whether to purchase a strap or not, just take the plunge. You won’t be disappointed!"
Markus S.
Cosmic Tide Edition
FAQs
We’ve got answers.
Yes, the clasps are sold separately.
You can add a clasp directly on the product page while selecting your strap options. This ensures the correct clasp size is paired and installed for your strap before dispatch.
We offer clasps separately because some customers prefer flexibility. Some rotate a single clasp across multiple straps, while others may already have a compatible clasp and don’t need an additional one.
Loop-less™ HydroFlex™ straps sit at the top of our range for a reason. They combine premium FKM rubber, a refined Loop-less™ construction, and meticulous finishing that took significantly more time and effort to develop. Months of R&D and prototyping went into refining the final version, with multiple iterations to get the balance of feel, fit, and finish exactly right.
You are not paying for a logo. You are investing in long term comfort, durability, and a strap that feels as considered as the watch it is paired with.
Yes. This strap is available in a variety of lug width sizes (18mm through to 23mm) to suit most major watch brands, and comes fitted with quick-release spring bars for tool-free installation.
Unlike a traditional buckle, the Loop-less™ clasp operates like a bracelet. Once sized, it locks to your wrist perfectly — no excess tail, no re-tightening, no keeper loops.
Yes. Our Loop-less™ straps are compatible with your OEM Omega deployant clasp.
To ensure a correct fit, the clasp size must match the width of the strap at the clasp end, not the lug width.
For example, if your selected strap tapers down to 18mm at the clasp end, you will need an 18mm OEM clasp, even though the lug size of the strap may be 20mm.
Absolutely. Our HydroFlex™ range of straps are designed for optimal comfort, ensuring they flex with your wrist, so you can wear it from desk to dive with no irritation.
Yes. HydroFlex™ is waterproof, salt-proof, and UV-stable. It won’t absorb moisture, crack, or fade — built for real use, not just display.
Total 5 star reviews: 333 Total 4 star reviews: 12 Total 3 star reviews: 5 Total 2 star reviews: 0 Total 1 star reviews: 0
99%would recommend these products
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350 reviews
- BCBenny C.CA, United StatesVerified BuyerReviewingLoop-less™ HydroFlex™ | Blood Moon Edition | Red Strap with Red StitchingI recommend this productRated 5 out of 5 stars11 hours agoHighest quality strap
The quality and comfort of the hydroflex straps is unmatched. They are a must have.
- KGKevin G.AL, United StatesVerified BuyerReviewingLoop-less™ HydroFlex™ | Orbital Moss Edition | Green Strap with White StitchingI recommend this productRated 5 out of 5 stars12 hours agoSimply the Best
Like many other watch enthusiasts, I discovered Artem via the You Tube watch community. My collection is made up of mainly divers and pilot watches. Most of them are 20 or 22mm in lug width. I struggled to find a strap that was functional, durable and most importantly…comfortable. The Hydro-Flex is unmatched. The best compliment I can give is that I don’t feel it on my wrist. It requires no break-in that a traditional sailcloth strap would need. Combined with the Loopless clasp, it slips on effortlessly. The quick release lug pins make removal and swapping easy. Many of my watches weren’t getting wrist time because the straps they came with simply weren’t comfortable. The Artem straps have made it possible to enjoy my entire collection now. Worth the investment….? Absolutely!
- CSChristopher S.MO, United StatesVerified BuyerReviewingLoop-less™ HydroFlex™ | Lunar Ash Edition | Grey Strap with White StitchingI recommend this productRated 5 out of 5 stars2 days agoBest Strap I have owned!
This is my second purchase from Artem, and I will continue to be a customer. Watch straps are simply top notch quality!
- KGKevin G.PA, United StatesVerified BuyerReviewingLoop-less™ HydroFlex™ | Solar Flare Edition | Orange Strap with Orange StitchingI recommend this productRated 5 out of 5 stars5 days agoWorth the Hype
If you’re a watch enthusiast with a prized collection, then you’ve heard of Artem. Simply put, the hype is real. The best compliment I can give is that you don’t even know it’s there. I have a rubber clasp strap for my Seamaster 300, and I love it, so I decided on the Loopless. Very comfortable, and takes just a few seconds to adjust for wrist swelling. The sailcloth outer is attractive and goes with pretty much anything I wear. The inner rubber liner is soft and plyable. No break-in required. There are quick release lug pins, so if you fancy a color change…no problem. I have since invested in multiple colors to accommodate my handful of 20mm diver and pilot watches. FYI…follow the sizing guidelines on the website. The next complement I can give is that I wear all of my watches more often now. There is nothing more disappointing than a great watch that comes with a terrible strap. In the end, Artem is worth the investment…
- DPDavid P.Verified BuyerReviewingLoop-less™ HydroFlex™ | Stellar Azure Edition | Light Blue Strap with Light Blue StitchingI recommend this productRated 5 out of 5 stars1 week agoAzure Blue Pops this Watch to Another Level
I’ve always loved my Duckworth Prestex Verimatic with its blue fume dial but the addition of the latest Loop-less Hydroflex Stellar Azure Edition takes the watch to another level. It pops and creates an eye catching summer vibe that has attracted lots of comments. Even had a serious collector friend ask me to get both the watch and strap for him.