The Hydralign Racer Goggle gives you a consistent line of sight, keeping your head in a stable, neutral position. They help keep you focused on everything you need for an accurate stroke technique and improved stroke tempo, which will increase your speed. Angled lens promotes proper head position, helping cut start and turn times. Mid-line lens markeer creates a more focused line of sight by guiding the head into the optimum angle. Mirrored lenses to reduce glare. Anti-fog and UV protection.