Yamamoto #39 Winter Wetsuit

The Gul Viper 6/5/4mm Hooded Steamer is built for riders who demand maximum warmth, flexibility, and durability in the harshest winter conditions. Made from premium Japanese Yamamoto #39 neoprene and reinforced with GRAPHENE X thermal technology, this suit offers elite-level insulation while remaining incredibly light and flexible.

Designed and tested by cold-water specialists, the Viper 654 is engineered to keep you warm, dry, and performing at your best — even in freezing European winter surf, wingfoil, and foil conditions.

Key Features

🔥 Ultimate Warmth: Yamamoto #39 + GRAPHENE X Core

• Premium Yamamoto #39 Limestone Neoprene — the highest grade available

• Absorbs less water, retains heat longer, and offers 6× the memory of standard neoprene

• GRAPHENE X BoltDry+ thermal wicking core keeps your chest, back, and vital organs warm

• Fast-drying interior that stays lightweight during long sessions

🤸 Unrestricted Flexibility

• Lava Fluid Stretch exterior — hydrophobic, lightweight, and ultra-stretch

• PIN STR||PE upper-body neoprene for maximum responsiveness and custom-fit movement

• Micro2Flex internal lining in arms & shoulders for paddling freedom

❄️ Cold-Water Protection

• Fixed Hood for full winter coverage

• C39 Wind Mesh kidney panel to block wind chill

• Aqua Barrier Chest Entry (ABS) for a watertight seal

• Twin-Cinch adjustable shoulder system prevents flushing

Construction & Materials

🧵 Pro-Level Seam Construction

• Glued & Blind Stitched (GBS) triple-glued panels

• Needle never penetrates fully → better waterproofing

• Lava Flow internal tape for stretch + reinforcement

• G-Tape inner waterproof taping for maximum seam durability

🦵 Durability Where It Matters

• PowerTex4 reinforced knees

• BEND embossed knee hinge → removes bulk & improves mobility

• Designed to last multiple winter seasons

❇️ Tech Overview

🖤 Yamamoto #39 Neoprene

• Non-petroleum limestone neoprene

• Superior heat retention

• Ultra light + stretchy

• Hydrophobic exterior reduces water absorption

🧪 Graphene X BoltDry+

Graphene-infused yarns increase warmth, speed up drying, and improve thermal regulation.

🌡️ True Thickness Foam

All panels are measured BEFORE lamination → you get true 6/5/4 performance.

📌 Performance Summary

The Viper 654 Hooded Steamer offers the perfect balance of:

• Extreme winter warmth

• Unrestricted movement

• Premium materials

• Long-lasting durability

• Excellent value compared to other Yamamoto winter suits

Ideal for:

✔ Winter surfing
✔ Wingfoiling & surf foiling
✔ Cold-water downwind
✔ Riders who want maximum warmth without losing flexibility

Product Features (Bullet Form for Shopify)

Details

• ABS: Aqua Barrier chest-entry

• PK Stainless Size 8 zipper

• Seam-free Pro Neck

• 3D Revo Fit panel design

• Liquid S-Seal wrist & ankle cuffs

• C39 Wind Mesh kidney panel

• Fixed hood

• Upper chest key loop

Materials

• Yamamoto C39 limestone neoprene

• X-flex hydrophobic Pin Stripe neoprene

• Ripstop Lava super-stretch lower body

• PowerTex4 knee panels

• Graphene X BoltDry core

• ThermoSpan lower-body lining

• Micro2Flex upper-body lining

• Lava Flow internal tapes