We usually call the SLi Shield Torso the invisible wind vest for cycling. The sleeveless undershirt is a true windbreaker with its wind-protective front, while the back`s perforated material also makes it breathable so you can get rid of sweat. You can`t go wrong with this as a baselayer on training days where wind is a factor. The torso is super light and race-fit (completely snug) - and can be used by both men and women as it is made in a unisex fit. The SLi Shield Torso is sewn with a front elastic 3-layer membrane that provides high breathability while protecting against wind and cooling in cold or wet conditions. The undershirt`s neck may feel non-elastic, but this is to make the torso as protective and effective as possible.