5mm Neoprene Diving Cap — 90% Neoprene / 10% Nylon Key benefits Effective thermal protection: 5mm CR (neoprene) high-elastic sponge plus double-sided bonded four-way elastic gauze blocks cold and retains heat to keep your head warm during cold-water activities. Comfortable fit and mobility: high-elastic CR sponge and elastic gauze deliver excellent stretch and a soft, delicate feel for unrestricted head and neck movement. Safer, drier ascent: an integrated exhaust hole releases excess air and water when surfacing, reducing lift and improving comfort. Sun and wind protection: scratch-resistant fabric with UPF 50+ provides strong UV resistance and windproofing for exposed conditions. Material and performance Composition: 90% neoprene, 10% nylon; construction uses CR high-elastic sponge and four-way elastic gauze laminated on both sides. Thickness: 5mm neoprene for balanced insulation and flexibility. Features: soft hand-feel, high stretch recovery, durable surface finish that resists abrasion and UV exposure. Function and compatibility Designed as a wetsuit hood/diving cap suitable for scuba, snorkeling, freediving and other cold-water or windy outdoor water sports. Works with most wetsuits and exposure suits; the stretchy construction adapts to typical head sizes and provides a snug seal with hoods, masks and collars. Use scenarios Scuba diving in temperate or cold water: reduces heat loss around the head and ears during long bottom times and surface intervals. Cold-water watersports: wear under a surf hood or on its own for kayaking, paddleboarding, or shoreline activities where wind and spray lower body temperature. Snorkeling and freediving: keeps ears insulated and limits water flushing to improve comfort and focus. Practical notes The exhaust hole helps manage buoyancy and water drainage during ascent; it is a functional vent, not a pressure-relief valve for deep diving. Care: rinse with fresh water after use and dry away from direct sunlight to preserve neoprene and the bonded elastic layers. Intended function: thermal protection, UV/wind resistance, comfort and mobility—no changes made to original specifications or materials.