BioBack is the smallest and most comfortably effective, medical grade back brace available on the market today. It's adjustable straps allow you to create a perfect fit for maximum efficacy. BioBack Pain Relief Brace is uniquely effective at relieving lower back pain. BioBack's light weight (less than 1 lb), small size allows it to be worn comfortably and discreetly during almost any activity to provide drug-free pain relief while immediately improving mobility and posture. Wearing the BioBack on a regular basis helps improve and maintain your body's alignment to a more proper, neutral spine, posture. Adjustable straps allow two (2) sizes to accommodate waists from 22" to 78" and allow you to achieve a perfect personal fit for superior results. BioBack should be worn comfortably tight (as tight as possible, while still being comfortable when sitting or performing your regular activity).