... Spring stay Size: S,M,L,XL Item: BK-018Description: Elastic Back Support Material: Nylon, Latex, Spring staySize: S,M,LFeature ... & Function: 19" high quality elastic is tapered in the front for a comfortable, contoured fit ... belt from rolling. Low profile hides well under clothing. Breathable & elastic fabricsIdeal for:1) Motion-related back pain & sciatica 2) ...