Thank you for viewing! (*^▽^*) This is a "sports glasses band" from SWANS. It has Velcro, so I think even children can easily put it on and take it off☆ I used it once, washed it, and stored it. Thank you. 【SWANS Swans】 Sports Belt DX A-21 Sports Band Glasses Strap ●Color: Black ●Size: Minimum 210mm to Maximum 260mm ●Width: Approximately 17mm ●Target age: Children to adults (length adjustable with Velcro) ●Made in Japan Ideal for preventing glasses from slipping during intense movements such as tennis, baseball, skiing, basketball, golf, running, and soccer! Easy to attach and can be adjusted to your preferred length. Infinitely adjustable Velcro type. ◆I will wrap it in bubble wrap and ship it via Yu-Packet Post. ◆Please purchase if you understand that it is a home-stored item. ◆There are no pets or smokers in the house.