Lip Protectant/Sunscreen. Seals in moisture to soothe & prevent dry lips. Smooth easy-gliding protection. Blistex Lip Balm helps prevent dryness and chapping. Its easy glide formula also soothes irritated lips. Dry, Chapped Lips: Blistex Lip Balm has three long-lasting protectants, and it seals in lip moisture to prevent drying of lip tissue. It glides on comfortably to provide complete coverage and avoid further irritation of chapped lips. Sun Protection: Blistex Lip Balm provides SPF 15 protection. Remember, lips don’t tan, but they do burn.