Required 2 part adhesive for fitting Sold in pairs Available in the standard \'bottle\' seal or trimmable with the same guide rings as neck seals. Size guide: Small = 17 - 17.75cm Standard = 17.75 + Trimmable = 16.5cm + The seal should feel snug but comfortable. If you experience any tingling in your hands, you need a bigger size. Note on Pronounced Wrist Tendons Some people have a tendon in the wrist that when flexed causes a \'groove\' or indentation that will allow water to channel up past the seals. If you experience this (and there\'s a limit to how much your undersuit sleeve can absorb !) try wearing the seal higher up, past the tendon. Or swap your existing seal for the commerical Manchette type which has a longer seal area. Keep all latex seals out of direct sunlight and any sources of ozone eg car fumes. Wash in clean water after use and dry before storing. Regular application of Seal Saver™ preserves and maintains latex and neoprene seals while inhibiting oxidation and deterioration.