Now friendlier than ever, the Brooks Ghost 4 embodies the spirit of running. Now with Brooks DNA, the new and improved Ghost 4 adds customized cushioning to its already generous comfort arsenal, plus Omega flex grooves for extra flexibility. Take them for a spin and become a believer. Profile Sockliner sits underfoot and is made of BioMoGo for cushioning and forms a contoured support sensation. Moisture-managing Element Mesh upper with synthetic overlay materials that are strategically located with the purpose of providing a secure fit. Anatomical Brooks DNA. Full-length BioMoGo. DRB Accelï¿½ is located at the bottom of the midsole in the midfoot. Full-length S-257ï¿½ Cushsole utilizes a full-length layer of advanced foam to provide cushioning and flexibility. Heel Caterpillar Tech attenuates shock and helps to ensures smoother transitions. Universal Sprung Platform. HPRï¿½ Plus high abrasion-resistant rubber located in the heel. Forefoot Cush-Podï¿½ Construction is an outsole design pattern intended to set the foot up for an efficient, balanced position from heel to toe. The focus of this design is on maximum cushioning and flexibility. Blown rubber forefoot provides responsiveness and flexibility. Wt. 9.3 oz.