Stretchy silicone eyewear retainer keeps kids’ glasses secure and comfortably in place. Pack includes 2 retainers: kids’ extra small/small size, and kids' medium size. Also includes 3 assorted ear cushions: small, medium and large for an even more secure fit. Attach the strap to the glasses’ temple arms to the desired fit (snug but not tight). Not suitable for styles with ultra-thin temple arms, sports goggles, and flexible kids' frames that include their own straps.