Aeroskin Polypropylene Swim Cap Polyolefin Swim Cap Comfort Neutrally Buoyant, UV Protection & Warmth Warmth, neutral buoyancy, abrasion resistance, and color stability make these garments ideal for use in high performance applications. Ultra-violet, thermal & abrasion protection for all types of water activities Designed for use in multiple activities either by themselves in warmer environments or as part of a layered system in colder environments