Infant size small armband 5" x 1.5" (130 x 38mm) reflective area, suitable for a circumference of 9" to 14" (225 to 350mm) Junior medium size 6" x 1.75" (150 x 45mm) reflective material, suitable for a circumference of 11" to 18" (275 to 450mm) Adult Large 8" x 2" (200 x 50mm) reflective material, suitable for a circumference of 14" to 24" (350 to 550mm) Don't just think about using Reflective products at night, even during the day when daylight is poor they can help you be seen and improve your safety. An inexpensive versatile safety product. Many uses including, personal safety, cycling, event promotion, walk to school, identification. Have them printed with your logo or text.