Summer Sky Large Flat Round Hair Clip in Blue. This hair clip is designed to allow you to lay back flat, do yoga, or sit comfortably in a seat with a headrest, and it is made with the same material that is nearly unbreakable. Lay down flat with comfort Bendable teeth for a secure yet gentle hold Lightweight, durable, and hair-friendly Perfect for all-day wear—from sunup to sundown The large size is great for thick hair. The large size is 4.25 inches long.