- 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 neoprenn strap. The comfortable toe piece is secured with a box X stitch and is sewn with bonded nylon thread. We added a half inch narrow strap option for the girly grom's. 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.