The best baby sun protection hats are at SwimZip! Our adjustable hats are created with specially made UPF 50+ UV sun protective fabric, blocking 98% of UVA and UVB rays. Adjustable chin strap and head strap, plus a side vent to let out the heat! Infants, newborns, and babies (and their parents!) L O V E SwimZip® wide brim sun hats.