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PRODUCT DESCRIPTION POWERFUL REBOUND SPRING FORCE:The strong stainless steel spring can help you you reduce the stress on your knees and enjoy better boosting results ONE SIZE SUITS ALL:Adjustable big size suits for all. Knee protection booster designed with a magic sticker which can be easily adjustable and fitted. Upper strap:13.4''/Lower strap:13''. The strap is elastic and can be stretched to 15.7''.  COMFORTABLE MATERIAL:The breathable fabric is non-slip and comfortable.Whether worn directly wrapped around your bare knees or over your pants, it still can protect your knees when moving heavy objects, running, playing basketball, working out, hiking and so on. USEFUL AND FREEDOM:The joint support knee pad will not restrict your movements and let you do any physical activity with ease.It will offer strong support when you're walking up or down an ince.