I used it once for a short time on the day it arrived, but I haven't used it since because it's a hassle to put the belt on. I haven't worn it for even 30 minutes. * No outer box, no extension belt Instant purchase ⭕️ Size XL ---------- [3-in-1 All-Rounder: Waist/Pelvis/Training] Considering the problems of modern people's lower back, pelvic misalignment, and poor posture, and how to reduce the burden, we seriously addressed this issue. After over a year of research and effort under the supervision of a specialist, a NEW pulley-type waist belt that can be tightened in seconds was born! An all-rounder that protects the lumbar spine, firmly supports the pelvis, and can be actively used for training. Simple yet lightweight design provides the strongest support in the industry. [Amazing Support!] Are you struggling with the lack of support from conventional waist belts? Are you dissatisfied with the fixation? You don't have to endure the pain anymore! The hiayuloo lumbar belt allows you to finely control the tightness around your waist with its unique adjustable belt technology, 10 pulleys, adjustment straps, and adjustment strings. [Tighten where you want to tighten!] With a light pull, you can instantly straighten your back. Based on ergonomics, it firmly secures the waist area, relieving fatigue in the lumbar spine. Recommended for those who experience strain on their lower back, such as those in customer service, caregivers, nurses, transportation, construction, manufacturing, and office work, or those with sudden lower back problems, and the elderly who want to maintain the health of their lumbar spine. [iF Design Award Winning Product] Lumbar Support Corset Hyayuro Waist Belt [JIS Certified] Posture Supporter Supports the waist from the pelvis Posture correction Prevents back pain Improves swayback and kyphosis Corrects rounded shoulders Pelvic correction [Jointly supervised by a Judo therapist x Physical therapist] Back muscle belt Diet Birthday present Men Women Gift Mother's Day Father's Day Respect for the Aged Day Health equipment Health goods "25cm size extension sheet" included