Shop › Flathead Lake Dad Cap - Sky Blue Image 1 of 1 Flathead Lake Dad Cap - Sky Blue $28.00 This hat will make any dad happy. This hat is soft and stylish. Makes for an adjustable backstrap for One Size Fits Most. Quantity: Add To Cart Added! This hat will make any dad happy. This hat is soft and stylish. Makes for an adjustable backstrap for One Size Fits Most.