Castelli - ESTREMO
WINDSTOPPER® X-Fast A light weight and stretchy membrane fabric for weatherproof protection and insulation. X-Fast features a Gore WINDSTOPPER® membrane for total wind protection with outstanding breathability. The fabric has a brushed fleece inner surface for excellent insulation and moisture transfer. The outer surface is treated with a DWR water-repellent finish to shed rain and spray before it is absorbed.