The 890v2s have New Balance's PL-1 Natural Last and a full-length ABZORB® cushioning insert for added comfort. The insert is removable if you want to use custom orthotics or arch support inserts instead. The midsole also features ABZORB® cushioning technology, as well as innovative REVlite technology, which offers exceptional support and responsiveness. In addition to being extremely durable, REVlite is also lightweight and New Balance claims it is 30% lighter than other foams with a comparable performance in underfoot cushioning and stability.
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.