Princess Helmet Cover: Tail Wags Helmet Covers Make It Fun for Kids and Adults to Wear Sports Safety Helmets. 1 Size Fits All Adult and Child Sports Helmets Our latest Princess helmet cover combines silky smooth stretch velvet, sparkly sequins and a veil that floats in the wind  all in soft shades of pink. This helmet cover is positively dreamy and trs belle! Available in one size fits all.