Foam and function New Balance 8507: Trainer that mates conventional forefoot foam with a foamless, rearfoot "NB ZIP" cushioning structure made of a dozen flexible struts. Likes: Comfortable, wide toe box and smooth ride. A firm, fast feel like the Mizuno. Tactile grip of a trail shoe; cool, breathable mesh upper. Priced far lower than the rest. Dislikes: Light feel, but just as burly as Adidas (14 ounces). Price: $85. (617) 783-4000; www.newbalance.com.
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