To make Jon's sleeves all you need is a yard of coated nylon pack cloth, a pair of wrist gaskets, 12" of Velcro and some Aquaseal adhesive. The latex wrist gaskets are available from most drysuit manufacturers and retailers. Get the right size for your wrists.
The sleeve is a tapered tube sewn to match the length of your arm from armpit to wrist. The top end needs to be wide enough to fit loosely around your upper arm with whatever clothing you'll be wearing. Hem the top and sew a Velcro tab for drawing the sleeve tight. The bottom end needs to be matched to the gasket and a form for gluing. A two-liter soda bottle (with a wrap of masking tape to keep the glue from sticking) makes a good form. When you sew the sleeve make sure that the bottom inch of it fits snugly around the bottle. To glue the gasket to the sleeve, stretch the gasket, right side out, over the top of the bottle and roll the end up into a 1" cuff. Slip the sleeve, right side out, on the bottom of the bottle to meet the gasket. Swab the cuff and a 1" band of the fabric with alcohol. When dry, carefully coat the fabric and cuff with Aquaseal. Roll the cuff down carefully and let dry overnight.
Treat the seams with Aquaseal. -Ed.

*Sources: www.kokatat.com/instruction2g1.htm
www.dagger.com/fluidmag/htdocs/back/back4/techtips.html

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