<b>More Details:</b><br><br> <b>Sponge pad:</b> inside the helmet can be removed, as it attached by Velcro.<br><br> <b>Size:</b><br> <b>S:</b> Fits a Dog with head width 4" and Circumference 12.3" .<br> <b>M: </b> Fits a Dog with head width 5" and Circumference 15.4" .<br><br> <b>Note:</b><br> Please measure your dog's head before choose the helmet size, make sure to choose the right size, the nylon belt can be adjusted to fit puppy's head.<br><br> <b>Ocassion:</b> The helmet can be used not only on Biking Cycling, but also a good cosplay costume item.<br><br>