Royal Robbins Avani Crew: Luxuriously soft and comfortable, the Royal Robbins Avani will likely become one of your favorite tops. Royal Robbins Avani Crew Features: Special blend of Tactel nylon with Lycra spandex is brushed on both sides for exceptional softness 4-way stretch maximizes motion and comfort Fabric provides UPF 40 protection from harmful solar rays Decorative stitching on arms and across chest adds style without the bulk of seams Materials: Fabric: 92% nylon/8% spandex