
Matt and David take on another round of Buy or Sell! They debate whether brands should be creating multiple variants of the same shoe, adding specialty uppers to existing models, spinning off new lines from popular shoes, and making dramatic changes to long-standing favorites. They also weigh in on whether uppers matter more than midsoles before closing out with a couple bonus mailbag questions. Want your buy/sell proposition or mailbag question on the next episode? Email us at doctorsofrunning@gmail.com!Rabbit is the presenting partner of our podcast. You can use code SUMMERDOCS to get 10% off your entire order of $50.00 or more. Note that the code is limited to one use per customer and can't be combined with other discounts. The code is active from 1st of every month to last day at 11:59PM PST, but don't worry because we'll be bringing you a new code every month. Shop now at https://www.runinrabbit.com.Our In For Testing segment is fueled by Skratch Labs! Get 20% off your first order from Skratch with code: DOCTORSOFRUNNING! https://www.skratchlabs.comChapters0:00 - Intro3:50 - In for Testing: Powered by Skratch Labs21:50 - Buy or Sell: Making multiple variants of the same shoe28:18 - Specialty uppers on existing shoes33:15 - Uppers are more important than midsoles36:16 - Creating new shoe models out of popular shoe lines44:47 - Dramatically changing a long-standing shoe51:08 - Mailbag: what causes black toenails?56:14 - Racing shoes to help with SI joint pain1:06:22 - Wrap-up
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#304 Mailbag! New Balance SC Rebel vs. Elite v6? Difference Between Rockers and Toe-Spring? Do I Need Flexible AND Rockered Shoe?

#303 2026 Daily Trainers Go Head-to-Head in Our World Cup!!

#301 Fact or Fiction? You Can Adjust to Any Shoe? Cooldowns are Important? 40+ Mile Weeks are Needed for Marathons?

#300 The Best Shoes We Tested So Far in 2026 (Episode 300!)
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