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  1. Home » Clothesline review: Comparing $300 shoes, Bontrager RXXXL vs. Fizik R3 » The RXXXL uses a plastic heal cup, perforated for ventilation. Photo: Brad Kaminski

The RXXXL uses a plastic heal cup, perforated for ventilation. Photo: Brad Kaminski

The RXXXL uses a plastic heal cup, perforated for ventilation. Photo: Brad Kaminski

The RXXXL uses a plastic heal cup, perforated for ventilation. Photo: Brad Kaminski