Water proof adhesive, guaranteed to stay on in the water. Secure tamper resistant die cut adhesive tab. Strong, durable and water resistant DuPont Tyvek. Excellent for short term use: concerts, water parks, school trips. Sequentially numbered for added accountability. 100% recyclable material. Recommended wear-time is 1 to 3 days. Wristbands fit child and adult size wrists. Made in USA. Product not subject to tariffs.