O'Neill Thinskins Neo-Skins feature strategically placed Premium Skins material and Recycled UltraFlex neoprene made of 85% or more recycled fibers within the neoprene liner fabrics. Designed to be a featherweight layer or worn alone, expanding your arsenal to fight the chill in all tropical conditions. Tailor your need for warmth with our lightest neoprene protection while defending against abrasion and UV exposure.