With the SH-WM83 Shoes, Shimano's ever-expanding line of women's-specific mountain footwear has a new queen. The springy soles also offer the option to mount toe spikes, so when the changing seasons render your favorite singletrack loop impassible, they transition easily to the sloppy run-ups of the cyclocross season. The WR83s' outsoles are polyamide reinforced with glass fiber and armored with debris-clearing polyurethane lugs. These soles are mated to synthetic leather uppers that resist stretching and incorporate cooling mesh panels. Given its specialization as a women's mountain shoe, the WR83 also enjoys some additional protection on the toe and is cut with a more slender fit, meant to accommodate a woman's foot. Shimano's Dynalast technology, which is the same last design used throughout the Japanese manufacturer's line, is similarly adapted. Dynalast involves lowering the toe-spring and heel section in relation to the arch and metatarsal areas. This creates an optimal pedaling angle on either side of the up-swing, so the dead time spot is shortened, increasing your pedal efficiency by a claimed . 56% on each stroke. While that doesn't seem like much at first blush, any cyclist who's ridden for longer than two hours understands that marginal gains like this can be the difference between starting the downhill first or being stuck in a slow-rolling line on impassable singletrack. A combination of one ratcheting buckle and two hook-and-loop straps lets you vary the fit across the length of your foot, giving you more security at the top and more room for metatarsal expansion at the forefoot. The insole contributes to the fit by comfortably keeping your heel stable. You don't have to ratchet the straps down to the point of losing feeling in order to keep your heel from slipping during sprints or uphill attacks.