HIGH QUALITY MATERIAL: This Xiaomi Mi Band 3 and 4 Bracelet are made of high quality silicone, soft, silky, skin-friendly,heat-resistant,wear-resistant,comfortable,lightweight,breathable and sweat-resistant for a comfortable fit. HIGH QUALITY MATERIAL: This Xiaomi Mi Band 5 Bracelet are made of high quality silicone, soft, silky, skin-friendly,heat-resistant,wear-resistant,comfortable,lightweight,breathable and sweat-resistant for a comfortable fit.