Mares 5mm Trilastic Scuba Diving Boots

Mares 5mm Trilastic Boots: Neoprene Dive Boot for Temperate-Water Scuba Diving

The Mares 5mm Trilastic Boots are a solid, purpose-built piece of foot protection aimed squarely at recreational divers who regularly dive in temperate or cooler water.

If you're diving in conditions where a thin summer suit no longer cuts it, and your feet are the first thing to complain, these boots are worth a close look.

What the 5mm Thickness Means for You

Five millimeters of neoprene is a practical choice for water temperatures that are cool but not extreme. It gives you meaningful insulation without the bulk of a drysuit boot.

The neoprene itself is Nylon 2 construction, which means a nylon fabric bonded to both sides of the foam. That outer layer resists abrasion and holds up to repeated use against fins, boat ladders, and rocky entry points.

A Smarter Ankle Than You Might Expect

One design detail worth understanding is how Mares handles the ankle zone on the Trilastic.

The neoprene around the ankle is made from a super-elastic "trilastic" material, while the lower section uses standard neoprene. This is a deliberate split: the ankle needs to flex and move without restriction, while the foot needs to hold its shape and stay warm.

In practice, that means the boot moves with you during the kick cycle rather than fighting your ankle joint. That matters over a long dive.

The Sole and Reinforcement

The sole is hard rubber with a sure-grip tread, which serves two purposes.

First, it protects your foot from rough surfaces on boat decks, rocky shores, or coral rubble during entries and exits. Second, a firm sole transfers your fin kick more directly than a soft, floppy one would, giving you better power transmission when you're actually underwater.

The front of the boot and the heel are both reinforced with vulcanized rubber. These are the areas that take the most punishment, and the extra material there extends the working life of the boot considerably.

Getting In and Out

The Trilastic uses a zipper entry with a built-in zipper dam. The dam is a simple but important detail: it stops water from seeping in through the zipper itself, which is a common weak point on cheaper boots.

The top edge of the boot is taped and sewn, and all seams are glued and sewn throughout. Together, those construction choices mean the boot holds together under repeated stress rather than delaminating at the edges over time.

Fin Compatibility

The heel includes a fin strap lug, a small ridge or loop designed to anchor your fin strap in place.

If you've ever had a fin strap creep up or slip sideways mid-dive, you'll appreciate this. It keeps open-heel fins seated correctly without you having to think about it.

Fit and Sizing

The Trilastic is a high-cut boot, meaning it extends above the ankle. That adds a layer of thermal protection at the ankle and helps the boot stay in place inside an open-heel fin pocket.

The boot is unisex and available in multiple sizes. Fit is important with neoprene footwear: too loose and cold water flushes through freely, too tight and circulation suffers. If you're between sizes, consider whether you'll be wearing a thin sock underneath, and size up if so.

Who These Boots Are Not For

If you dive primarily in warm tropical water, 5mm is more insulation than you need and may leave your feet uncomfortably hot on the surface.

These are also scuba-specific boots designed for open-heel fins. They are not designed for full-foot fins or for use as wetsuit boots inside a drysuit system.

For cold-water or technical diving in genuinely frigid conditions, you would likely want a thicker boot, 6mm or 7mm, possibly with a more reinforced ankle structure.

The Short Version

• Material: Nylon 2 neoprene, 5mm throughout
• Ankle zone: Super-elastic trilastic neoprene for unrestricted movement
• Sole: Hard rubber with sure-grip tread
• Reinforcement: Vulcanized rubber at toe and heel
• Seams: Glued and sewn; top edge taped and sewn
• Entry: Zipper with zipper dam
• Cut: High cut, unisex sizing
• Fin strap lug: Yes, at the heel

The Mares 5mm Trilastic Boots are a well-constructed, no-fuss option for recreational divers who dive in cooler water with open-heel fins and want a boot that will hold up over multiple seasons without constant replacement.