Shop › OUAI Fine To Medium Hair Treatment Masque - 8oz Image 1 of 1 OUAI Fine To Medium Hair Treatment Masque - 8oz $35.00 This mask was made for fine to medium strands to hydrate, fight frizz, and repair damage for smoother, healthier hair. Add To Cart Added! This mask was made for fine to medium strands to hydrate, fight frizz, and repair damage for smoother, healthier hair.