Material composition: Nylon: 90% [Upper Arm Compression Inner PIN-SLIM] Tighten and achieve a beautiful posture for those with flabby upper arms, a hunched back, and rounded shoulders! Instantly achieve a beautiful, slim figure with 3-stage compression※ (based on the effect when worn) [Upper Arm Care] Tightens the arms with optimal compression for the most beautiful appearance. [Beautiful Posture Keep] Opens up a rounded back and inward-turning shoulders, allowing you to maintain a beautiful posture effortlessly while going about your daily life. [Warmth with uneven massage] The specially processed fabric on the back massages the upper arms accurately according to the body's movements. Promotes circulation and keeps you warm even with casual movements♪ [Material with excellent elasticity and durability] Spandex, suitable for compression, has excellent elasticity and durability, making it the most suitable for maintaining a beautiful posture. [Recommended for those who:] Have flabby upper arms, a hunched back, rounded shoulders, poor posture, want to look slimmer, are concerned about swelling, circulation, stagnation of lymph, detoxification of waste products in the body, and unnecessary water. [Size] L size (Sleeve length: 26~32cm / Shoulder width: 39~46cm) [How to wear] 《STEP1》 Slowly put your arms through one at a time. 《STEP2》 Pull up the sleeves evenly while gathering them. 《STEP3》 Adjust any slack or distortion to complete.