The midweight team sky base layer is made for cool conditions or even high intensity cold weather rides where wicking moisture away from your skin is the first goal the hydrophilic prosecco treatment spreads the moisture out over a larger area for quicker evaporation castelli use two different weights of this fabric with the thinner layer used where it will be covered by your shortstights or bib straps so that you donrsquot have too much insulation where you donrsquot need it