Unisex Zoom Fly 6 W Horizon 7 Long Runs: The plush cushioning

Long Runs: The plush cushioning makes the Glycerin 21 ideal for long-distance running

Blown rubber outsole provides durability

the Glycerin 21 is the better choice

Brooks updated the upper with a more refined engineered mesh that offers better breathability and a slightly more adaptive fit

Unisex Zoom Fly 6 W Horizon 7 Long Runs: The plush cushioningOverview & Specs The Zoom Fly series has long aimed to bridge the gap between high performance racing shoes and everyday trainers. The Zoom Fly 6 is Nikes latest version in that line, pushing more of a super trainer hybrid race trainer angle. Here are the key specs: Metric Value Description Weight ~ 265 g 9. 3 oz (mens US 10) though some testers recorded ~ 244 g 8. 6 oz in a mens 9. Stack Drop Nike claims ~ 40 mm heel 32 mm forefoot (i. e. an 8 mm