FIT & DESIGN : Unique cross-strap design stays put Velcro® for easy on and off High-density foam maintains its shape One size fits most (shoulder adjusts ~ 4”, waist adjusts ~15”, circumference adjustable from 36” to 60”) 20 LB vest can be adjusted down in 1lb increments 40 LB vest can be adjusted down in 2lb increments Kevlar fibers are approximately 5% of the material blend