The orange Boostic R is good and stiff.
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climbing shoe
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The Boostic R drives more power through edges than the Instinct, with a much narrower heel; amazing on tiny sloping slab feet.
Has both and loves them: the Boostic R feels stiffer just in the forefoot.
Wears the Boostic R in a 40.5 comfortably for a few hours.
Uses the Boostic R as their stiff shoe, paired with the Drago XT as an amazing two-shoe sport quiver.