Feel unstoppable wearing Speedo’s latest innovation developed by swimmers for swimmers.Feel unstoppable wearing Speedo’s latest innovation developed by swimmers for swimmers. The striking Fastskin LZR Pure Valor ‘Electric Strike’ Jammer is made from lightweight material and features moderate compression and construction designed to support a greater range of movement. The compressive inner leg seam is designed for greater muscle support so you get the best out of your swim. The regular waist jammer style offers greater flexibility and may be preferred by breaststroke and IM swimmers. This product has been fully approved by FINA.