We really don't care if it's sunny or not with sunglasses this bright & stylish we'll wear them in the rain. The printed arms are so eye-catching we could stare at them all day. Avoid leaving sunglasses in direct sunlight such as the dashboard of a car the intense heat will damage the lenses distort the plastic & cause the metal to exp&. Wearing sunglasses on top of the head may also distort the frame shape. Please store them in the case provided.