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.