The "Original" In-The-Shoe Wedge - designed by Paul Swift. One ITS Wedge gives a true 1.5 degrees of varus tilt, and unlike the competition, they're reversible... the ITS Wedge works in either shoe!
A great, quick, alternative when Cleat Wedges may not work with your cleat system, e.g. with SPD cleats, where connection is limited by size and there is a potential for "rougher" riding, off-road. Fills in volume if your shoes are loose fitting. Not recommended if your shoes are already tight, or snug fitting.