Castelli Sorpasso Bib Tights Polyester Rosso Corsa label indicates Castelli's very best product Thermoflex Core Due fabric uses a hollow-core polyester inner layer to trap warm air while wicking moisture to the outer nylon/Lycra layer where it quickly evaporates, plus the fabric rejects water, keeping the tights feeling dry even when wet Thermoflex fabric with a fleecy inside traps warm air next-to-skin while its high stretch offers a streamlined fit Soft and stretchy Progetto X2 chamois adapts to the shape of your body and uses variable thickness padding for long ride comfort Giro++ bib straps stay in place when in the cycling position