What Our Gearhead(R) Experts Are Saying:"I've worn this under my jersey on the hottest rides of the summer and it never once felt clammy against my skin. The recycled polyester wicks sweat fast enough that I forget it's even there under my bib straps. It's my go-to for any ride where the heat is the real competitor."The Lightweight Sleeveless Base Layer is made for the rides where the heat sets the pace, and every extra layer works against you. Rapha built this piece to sit close to the skin without adding bulk, so it works quietly under a jersey while you focus on the effort in front of you. Recycled polyester does the heavy lifting here, pulling sweat away from the body and keeping temperature in check through the hottest stretches of the ride. It's a base layer built to be forgotten about once you're moving, sitting flat and smooth under bib straps so nothing chafes or shifts between you and the finish.