The best tight weve ever made this is it the tight that is getting glowing reviews from magazine testers all over the world and is also the favorite among the castelli test crew the comments that keep coming up are the great fit along with exceptional comfort down to very cold temperatures or even when the thermometer rises the secret to the great fit is the mixture of thermoflex core2 along with our standard thermoflex which lets us create just enough stretch but with enough support to ke