Power Form Compression technology Endurance®+ fabric Chlorine resistant Durable Improve your swimming technique with Speedo's innovative Fit Power Form Jammers Swimming Shorts. These swim shorts have a range of features to maximise your time in the water for a faster, more efficient swim. Technique-enhancing compression panels encourage better body positioning of key muscles, while the Endurance®+ fabric is 100% chlorine-resistant, quick drying and retains its shape for longer.