A superb UV shield giving you UPV 50+ sun protection. This 8oz Evotherm fabric with flatlock durable seam construction provides maximum protection against wetsuit rubs and rashes as well as sun. Thumb loops keep it in place when worn under a wetsuit. Key features include FLATLOCK: seam construction, EvoTherm X fabric: 4-Way Stretch Thermal, Breathable, Wind Block, and UV shield: UPF 50+ sun protection.