A "stretchy band" is a type of elastic material that can be easily stretched and then returns to its original shape when released. It is often used for exercises, physical therapy, or securing items tightly together. Full definition
The flat crown and stretchy band of the hat enables a perfect fit. (shoes.com)
On the outside, you'll find soft, stretchy bands around the legs and waist. (simplymombailey.com)
Work it out in this sweatshirt with stretchy banded hems and long sleeves that can be scrunched up to the elbow and paired with an excellent pair of sneakers for those comfy, do - it - all sort of days. (sophieandtrey.com)