On unusually cold mornings, pull the Gore Bike Wear Women's Base Layer WindStopper Sleeveless Singlet on under your jersey to protect your core from the chill. This practical top features a polyester fabric with a laminated WindStopper membrane along the front, over the shoulders, and down the back; stretch panels on the side mean your mobility won't be compromised. For all the protection it offers, the singlet is still thin and soft; flatlock seams mean you won't get chafed, either.