The wrist band is adjustable suitable for most size of the wrist or ankle. It is applicable to any men, women, adults, children and the elderly such as for runners and cyclists, campers. It can be worn on your hands, wrists, ankles, hair. Wearing it, you will be easily seen at night. Features - Color: Fluorescent yellow - Material: highlight elastic reflective thermal film. - Size: About 9 x 9 x 5 cm. - This item is manufactured with highlight elastic reflective thermal film material for durable and long-lasting use. - The glowing design and reflective cloth will ensure runners security and adding fun for them. - The exquisite structure and handcraft make it looks unique and distinctive. - You can wear it on wrist, ankle, or clasp on your bag, It is always a bright safe sign wherever you carry. - It's a great activity party favors and sports accessory for night.