Old 06-17-14, 02:13 PM
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Location: Cedar Rapids, IA
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Bikes: 1997 Rivendell Road Standard 650b conversion (tourer), 1988 Schwinn Project KOM-10 (gravel/tour), 2013 Foundry Auger disc (CX/gravel), 2016 Cannondale Fat CAAD 2 (MTB/winter), 2011 Cannondale Flash 29er Lefty (trail MTB)

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Neoprene the cheap: find a trashed wetsuit (scuba suit), and cut off a sleeve or pant leg. Just fold the ends inside, doubled over (like a sock)

Ask around/search CL and garage sale listings; you never know what folks have brought home from a vacation.

Otherwise, you could probably fashion something out of some cheap, lightweight insulating material (think the mylar car sun shades), as Looigi suggested. Silver A/C vent tape would complete the look...
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