Personalized Bike Bum Toddler Full Zip Hooded Jacket. Bike bum text with a heart dotting the letter i in the word bike is a fun gift design for bicyclists at birthdays and holidays. 7.5 oz., 60/40 cotton/polyester. Jersey-lined double-needle hemmed hood. Pouch pockets for all their treasures. Coverstitched shoulders and armholes. Coverstitched rib waistband and cuffs.