Rubber and Silicone Watch Straps: What to Know Before You Buy
By James Alderton . 9 min read . Updated June 2026
Rubber and silicone straps are the default for sport and dive watches, but not all rubber straps are made from the same materials or to the same standard. The difference between a $10 silicone strap and a $45 FKM fluoroelastomer strap is not just price: it is the difference between a strap that softens and smells after a summer and one that survives years of salt water, UV, and gym use without degrading. This guide covers the material differences, what to look for in construction, and the best options including the ZULUDIVER FKM Rubber Dive Strap for dive use, the Nomad Sport Band for Apple Watch for Apple Watch, and the Barton Elite Silicone Sport Strap for traditional-lug sport watches.
The short answer
FKM fluoroelastomer is the best rubber strap material for demanding sport and dive use. Standard silicone works well for casual and gym wear. The ZULUDIVER FKM Rubber is the best dive strap. The Nomad Sport Band is the best Apple Watch silicone band. The Barton Elite Silicone Sport is the best silicone strap for traditional lug watches.
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Silicone vs FKM: the material that matters
Standard silicone is soft, flexible, and inexpensive. It handles everyday water exposure, sweat, and casual sport use well. Its weaknesses appear over long-term exposure: UV breaks down the surface, repeated oil and chemical exposure causes softening and discoloration, and sustained heat (summer car interior, extended sun exposure) causes deformation in lower-quality formulations.
FKM fluoroelastomer, also sold as FPM or under the Viton trade name, is a synthetic rubber with significantly better resistance to UV, oils, fuels, extreme temperatures, and saltwater. It is the material of choice for professional diving instruments and high-performance sport watches. The trade-off is a firmer initial feel that softens over the first few weeks of wear.
Best dive strap: ZULUDIVER FKM
The ZULUDIVER FKM Rubber Dive Strap is the most complete dive strap for traditional-lug watches. The FKM compound handles repeated saltwater submersion without degrading, the ventilated design reduces suction and water trapping underwater, and the curved end profile fits popular sport watch lug shapes cleanly.
It is available in 20mm and 22mm. The stainless tang buckle is signed and corrosion-resistant. For a watch that actually gets used in the water this is the correct upgrade over a stock rubber strap.
ZULUDIVER FKM Rubber Dive Strap
A fluoroelastomer rubber strap made for dive watches, with a curved end profile for popular sport watch lug shapes, a signed stainless tang buckle, and a ventilated design for underwater comfort.
Best Apple Watch sport band: Nomad Sport Band
The Nomad Sport Band for Apple Watch uses Nomad's proprietary silicone formulation, which is noticeably softer and smoother than Apple's stock sport band. The matte finish resists light reflection and does not grab arm hair, which is one of the most common complaints about budget silicone Apple Watch bands.
The stainless steel pin and tuck closure eliminates the loose tail flap that most Apple Watch bands leave dangling. Available in muted colors that look more deliberate than the bright options in Apple's range.
Nomad Sport Band for Apple Watch
A premium silicone sport band for Apple Watch made from Nomad's proprietary soft-touch silicone. Smooth matte surface, stainless steel pin buckle, and available in Apple Watch sizes 41mm and 45mm.
Best silicone strap for traditional lug watches: Barton Elite Silicone Sport
The Barton Elite Silicone Sport Strap is the most polished traditional-lug silicone sport strap in its price range. The matte surface texture looks clean on a tool watch and the quick-release pin version makes strap swapping entirely tool-free.
It is soft from the first wear with no break-in required, which is a meaningful advantage over FKM if you want comfort immediately. For gym use, casual sport, and any watch that sees regular water contact without professional diving, this is the right choice.
Barton Elite Silicone Sport Strap
A traditional-lug silicone sport strap from Barton, designed for 20mm and 22mm cases. Matte surface texture, stainless buckle, and a quick-release pin option. Soft from day one without the stiffness of FKM.
Budget silicone for casual wear: Hemsut Soft Silicone
The Hemsut Soft Silicone Sport Watch Strap does the basics well at a low price. Soft, flexible, waterproof, and available in multiple colors. The material quality is not as refined as Barton or Nomad, but for a backup strap, a child's watch, or a non-precious daily driver that will see hard use, it is a sensible, low-risk purchase.
Hemsut Soft Silicone Sport Watch Strap
A budget-friendly silicone sport strap from Hemsut, available in 20mm and 22mm. Smooth finish, stainless pin buckle, and a soft flexible build suited for active daily wear.
Cleaning rubber and silicone straps
Silicone and rubber straps are the easiest to clean of any strap material. Rinse under fresh water after ocean or pool use. For deeper cleaning, the iSonic Ultrasonic Watch Strap Cleaner reaches the buckle holes and textured surfaces that a brush misses. Avoid silicone-based cleaning sprays directly on silicone straps, as they can cause surface tackiness over time.
Metal hardware on rubber straps should be dried after saltwater use to prevent corrosion at the pivot points. A brief soak in fresh water followed by thorough drying handles this with no additional products needed.
iSonic Ultrasonic Watch Strap Cleaner
A compact ultrasonic cleaner sized for watch straps, bracelets, and small watch components. 42kHz cleaning frequency, digital timer, and a stainless steel tank that holds 600ml. Effectively removes skin oils, salt deposits, and soap residue from metal and rubber straps.
Featured in this guide
ZULUDIVER FKM Rubber Dive Strap
A fluoroelastomer rubber strap made for dive watches, with a curved end profile for popular sport watch lug shapes, a signed stainless tang buckle, and a ventilated design for underwater comfort.
Nomad Sport Band for Apple Watch
A premium silicone sport band for Apple Watch made from Nomad's proprietary soft-touch silicone. Smooth matte surface, stainless steel pin buckle, and available in Apple Watch sizes 41mm and 45mm.
Barton Elite Silicone Sport Strap
A traditional-lug silicone sport strap from Barton, designed for 20mm and 22mm cases. Matte surface texture, stainless buckle, and a quick-release pin option. Soft from day one without the stiffness of FKM.
Hemsut Soft Silicone Sport Watch Strap
A budget-friendly silicone sport strap from Hemsut, available in 20mm and 22mm. Smooth finish, stainless pin buckle, and a soft flexible build suited for active daily wear.
Barton Elite Silicone NATO Strap
A single-piece silicone NATO in Barton's signature smooth finish with a stainless steel buckle. Waterproof, odor-resistant, and notably more comfortable than nylon on hot days.
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