1mm Blue Wetsuit Beanie Cap 1mm Wetsuit Beanie Cap with SuperStretch tech neoprene, reversible 6 panel design flatlock stitching help maintain core body temperature by minimizing heat that escapes through the top of the head. ~1mm Premium Neoprene ~SuperStretch Neoprene: form fitting and maintains shape ~80% Neoprene, 20% Nylon ~Extremely lightweight, flexible and durable ~Premium Quality neoprene ~6 Panel Construction for better fit ~Flatlock seam stitching ~Durable, Flexible, Strong and built to last ~Smooth and comfortable with smooth black lining ~Stops heat from escaping through the noggin ~Reversible to all black option ~Helps maintain core body temperature by minimizing heat loss from the head ~ Insulates a thin layer of warm water around the head ~Protective DWR coating wicks water away ~Provides warmth sun protection: Wet or Dry ~Wicks water: Wet or Dry ~100% wind and sun resistant ~Wear alone or under helmets ~Built for comfort, function performance ~Low profile and covers most of the ears ~One size fits most adult heads snuggly ~7 1/2 inches Bottom of Cap to Peak-Height of Cap and 11 inches across-Width 1mm Wetsuit Beanie Cap Temperature Recommendation: 72 degrees and up Hand wash with mild detergent, non-toxic-if possible, weekly. Rinse with fresh water after each use thoroughly, air dry on flat surface. Reviews: I was really surprised how much a simple cap could make keeping me warmer in the water; it really does trap the heat that escapes through the top of the head. Seriously Recommend! -Billy