Designed for sports lovers and adventure seekers in the water, in the sky or on land, this timepiece is part of the Prospex 300m Divers Collection by Seiko. Combining high durability and comfort, the accordion-style silicone design was invented by Seiko in 1975 as a practical solution to the expansion and contraction of a diver's wrist at different depths. This model also features simplified indices making it easy to read underwater, with the new ISO standard engraved on the case back, stating its diver's watch capability and metre depth for saturation diving.Since launching Japan’s first diver’s watch in 1965, Seiko’s innovative watchmaking has changed global dive watch standards. This particular design has been affectionately nicknamed by Seiko fans as a ‘Tuna’ - because of its larger diameter and bold shape like a tuna tin – and has been loved for decades since its release.300 metre water resistance, so is perfect for divingLong lasting and rust resistant stainless steel casePowered by a quality quartz movement