Castelli Size Chart The Core 2 is an unpadded stretch short designed for run training and short-distance races. Its Pace 3 fabric is lightweight, breathable, and quick-drying. Lie-flat elastic ensures a comfortable fit, and a zippered rear pocket carries essentials. Features: - Pace 3 Lycra(R) fabric - Lie-flat GIRO3 elastic - 1 rear pocket - Liner without padding for running comfort - Weight: 97g