The bamboo ribbed zip-up romper is surely your new favourite outfit for your baby, body-hugging fit feature fold-over, mitt-sleeves for added warmth, and protection from self-scratching. Rainbow pattern silicon grip soles on all sizes to prevent slipping. Thoughtfully designed with elastic on the back of ankles for a stay-in-place perfectly fit. They are true to fit but always recommend sizing up. Machine washable. Made from 96% bamboo rayon, 4% spandex.