Personalized Funny Hydraulic Engineer Toddler Full Zip Hooded Jacket. Funny Hydraulic Engineer Toddler Full Zip Hooded Jacket - Black say "Flow Rate Beer Hydraulic Engineer" in black text and makes a fun gift design for ale loving engineers! 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.