This is the Bare 7/3mm Ultrawarmth Hooded Vest Womens Scuba Diving Hooded VestFeatures: Take Your Wetsuit System to New Level of Warmth High Loft Celliant Inner Fabric Double Glued and Blind Stitched Seams 5mm Nylon & Celliant Lined Neoprene Rubber Secure-Lock Construction Improves Isolation and Reduces Flushing Keeps You Warmer and Diving Longer 3mm Skin-In Face Seal Bare&';s GEN2 Hood Vent Allows Trapped Air to Escape w/o Letting Water Enter Mask Strap Grip Pad: Secures Mask Strap In-Place Celliant Fabric Liner: Highest Degree of Warmth Enhanced with 13 Thermo-Reactive Minerals Woven into Fabric React to Body Heat Converting it to Infrared Energy Reflects it Back to Body, Increasing Circulation and Body Warmth Ultrawarmth Hooded Vests are designed to keep you warm throughout your core and head with high-loft Ultrawarmth Celliant Infrared Thermal technology embedded in the inner fabric. Celliant is scientifically proven and FDA-determined to conserve body heat and accelerate thermal recovery. GEN2 hood vent allows trapped air to escape and prevents water from entering, while skin-in face seal-and neck seal that mates with the wetsuit collar- prevents water flushing. Ultrawarmth Hooded Vests can be worn inside or outside your wetsuit and can be added to any wetsuit for added core warmth.