PACK PACK: Our PRO straps now come in 2 leg straps (measuring 2" wide x 40" long) and 2 arm straps (measuring 2" wide x 26" long) + carrying bag, making them perfect for bite training Complete set. They are designed to provide excellent blood flow restriction to the targeted muscles through the working limb. These blood flow-restricted bands reduce oxygen supply to the muscles, causing slow-twitch muscle fibers to fatigue prematurely and reducing their response to exercise load. Factors that increase muscle growth: Research shows that training can increase muscle protein synthesis, NOS-1 expression, and mTOR signaling, leading to increased muscle growth. Research has also shown how using a tourniquet during training can promote muscle growth and enhance muscle-building potential by reducing myostatin levels. Lean Muscle Faster and Great Tone Without Lifting Heavy Weights: Occlusion training bands lead to very low load hypertrophy (usually 10-30 percent of 1RM). When applied to the working limb and combined with loads of 10-30% 1RM (high number of repetitions and very low rest before fatigue sets in), the results are usually close to those obtained at 80% 1RM. In fact, Ischemic Bands can lift weights easily and effortlessly, delivering lean muscle and awesome sound. ULTRA STRONG AND ULTRA COMFORTABLE STRAPS: Featuring extra-strong stretch harness, quick-release buckle and stretch loops to maintain slack PRO Package training straps are easy to attach and can be easily removed and worn on the working limb when your workout is complete Very comfortable. Each pack order comes with 4 tourniquets for occlusion. If you use a bicep strap or thigh strap, it will maintain its shape and elasticity.