Garneau Baryum Shoes - Black Mens Size 39Garneau Baryum Shoes Black Mens Size 39. The Baryum features a Racer PRO fit expandable X Comfort Zones stretch to reduce numbness and Power Zones provide excellent energy transfer when pedaling. Power Zone a non stretchable laminated section of the upper allows for better transfer of energy when pedaling and also prevents the shoes from tightening and causing numbness Expandable X Comfort Zone stretches up to 5 mm to provide comfort and to prevent