O'Neill Psycho Tech 4/3+mm Wetsuit - Back Zip O'Neill A medium - large fit/coverage

A medium - large fit/coverage with stainless steel hinges and an anti-reflective hydroleophobic lens coating

RUBBER: Ultraflex SL Neoprene

SEAMS: Glued & Blinstitched

If that wasn't enough

O'Neill Psycho Tech 4/3+mm Wetsuit - Back Zip O'Neill A medium - large fit/coverageO'Neill's Psycho Tech range focuses on ultimate warmth and durability with high performance recycled materials and water tight double sealed stitchless seams. Sustainable TB4 Firewall technology radiates throughout with TB4 Duraskin Air Firewall in the chest and back to shield against the cold while retaining and recirculating your body heat. Designed to keep you in the water longer, toasty, and stoked. F. U. Z. E. Closure (Chest Zip) Redzone Water