Lululemon Define Jacket Gray Thumbholes Womens Small Lululemon Define Jacket features a full-zip front, high collar, and signature curved seams that create a "second skin" fit. Luon™ fabric, which is sweat-wicking and offers four-way stretch. Thumbholes and Cuffins™: Help keep sleeves in place and hands warm. Zippered Pockets: Secure storage for small essentials. And large inside pockets. Locker Loop: Located at the back for easy hanging. Elastic Zipper Pull: Often doubles as an emergency hair tie. Size Small.