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Lightweight and comfortable; Dynamic Support system provides good stability and control for women with over-pronation issues; Lunarlon provides good responsive cushioning (one reviewer called it more "springy" than the LG3); sleek design with lots of cool off-the-shelf styles and ability to customize; Nike+ ready

Dynamic Flywire support may be uncomfortable for some users if the cords are putting too much pressure on top of the foot.

Stability

$110 (or $145 if you customize)

2-year limited warranty against manufacturing defects and 30-day satisfaction guarantee

10 (size 10)

The LG4s have a single-layer engineered mesh upper for improved breathability. For a secure and supportive fit, the uppers also feature Flywire saddle technology, which is basically a series of cables between the mesh and inner sleeve that are attached to the midsole and lacing system around the midfoot and arch area. Additionally, the uppers have some reflective materials to provide enhanced visibility in low light conditions.

The tongue and collar are padded for added comfort and to prevent the heel from slipping. There is also a floating heel-support clip in the heel counter to control over-pronation.

The LG4s have a foam insole that provides lightweight cushioning, but, if you customize your shoes, you can opt for a responsive or cushioned sockliner. The Nike+ Sensor fits underneath the sockliner in the left shoe in all models. The LG4's midsole features the Dynamic Support system, which is made up of Lunarlon and a firmer carrier foam, to provide additional stability, cushioning and comfort during the gait cycle. Lunarlon foam is 30% lighter than traditional Phylon and offers responsive cushioning that exceptionally resilient even after long runs. Unlike previous LunarGlide+ models, the LG4's Lunarlon component is now independent from the firmer carrier foam and much more substantial.

Unknown

The heel of the LG4's outsole is designed with BRS 1,000 carbon rubber for durability. It also has Nike Natural Motion Engineering flex grooves carved alongside the length of the outsole and across the forefoot. Unlike previous LunarGlide+ models, the flex grooves on the LG4 are deeper, which allow your foot to move naturally and more efficiently.

It is available in 13 different color combinations.

Yes

It comes in full and half sizes ranging from 6 to 15. It is available in a normal width (D), but there are other widths available for customized shoes.

Yes, Nike says the LG4 fits true to size for men's athletic shoes