3M Scotchlite Reflective Neoprene Arm and Leg Bands SOFT NEOPRENE with VELCRO CLOSURE: comfortable and adjustable fit COMES WITH 2 NIGHTBAND'S AND A HANDY CARRY POUCH: carry your pair of reflective bands with you everywhere HIGHLY REFLECTIVE: 360 reflectivity and visibility in any weather or low-light condition. Reflective up to 750-1,000 FEET. ANSI 107-2010 compliant (CPL 500). 3M Scotchlite's highly reflective film contains crystals that bounce the light back to the source. When a car's headlights illuminate the NightBand's the film "lights up" and sends the reflection back to the driver. AVAILABLE IN 3 ADJUSTABLE SIZES: Please measure where you plan to place your NightBand's: Size Small fits around an arm or leg that measures approximately 8-1\2 to 10-5\8". Size Medium fits around an arm or leg that measures approximately 10-1\2 to 13". Size Large fits around an arm or leg that measures approximately 13-3\8 to 16.5". NightBand's are also available for dogs in 3 sizes. HAND WASHABLE - LINE DRY