Run Testers Tom and Nick are long-term fans of the Brooks Glycerin line and the 20th edition of the shoe is a particularly exciting one, because it has an updated midsole that uses the DNA Loft V3 foam Brooks introduced on the outlandish Aurora-BL shoe last year. 

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This nitrogen-infused foam should make the Glycerin 20 a livelier shoe than previous editions, but will it still be as comfortable? Tom and Nick took it out for a spin to find out.