A UPF 50+, 8oz brushed Evotherm fabric with flatlock seams provides maximum protection against wetsuit rubbing, rashes and the sun's rays. Thumb loops prevent slippage when worn under a wetsuit. This garment offers a superb UV shield with UPF 50+ sun protection. The 8oz Evotherm fabric with flatlock durable seam construction provides maximum protection against wetsuit rubs and rashes, as well as sun exposure. Thumb loops are included to keep the rashvest 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).