The Shimano RC503 shoes are an innovative and lightweight option designed for cyclists seeking maximum efficiency and comfort with every pedal stroke. With an advanced design that combines technical materials and BOA® fit technology, these shoes offer a secure and enveloping fit, ideal for those who demand high performance on the road without sacrificing lightness or durability.Features:Use: RoadWith S-PHYRE DNA. L6C BOA® with textile laceSynthetic leather and upper pattern similar to RC7/RC9Carbon fibre reinforced nylon soleSeamless midsole structure Enveloping upper Recycled material for the toe and midsoleType of last: SHIMANO DYNALASTMidsole: Glass fibre reinforced nylonWeight: 235 gTechnologies:BOA L6: Steel lace closure system, nylon guides and a mechanical reel designed to address the long list of deficiencies found in traditional closures.