- The Kids Grombows are soft and squishy. Your Grombows will love their Grombows -- guaranteed. Our kids Grombows are soft and squishy, with a smooth, comfortable neoprene strap. The comfortable toe piece is secured with a box X stitch and is sewn with bonded nylon thread. Made for comfort with our regular 1 inch strap. The Rainbow logo is found on both the strap and is embossed in the top sole. The bottom is the Rainbow Non-Slip sole. For the toddlers the four smallest sizes come with a back strap attached at the heel, if you don"t need it, just cut it off.