For the perfect fit while training and racing the speedo fastskin3 elite swimming goggles have iq fit double silicone strap and ensure improved performance and increased field of vision thanks to a hydrodynamic design and hydroscopic lenses approved by fina fdration internationale de natation these fast and lightweight premium quality goggles are made for serious swimmers and offer quick and easy adjustment using the tensioning scale they are part of speedos racing system and guarantee