All models feature: Auto Tension Adjustment Concept for easy engagement and dependable release, Sensor Elasticity Tuner for adjustable sensation of float*, 10 degree rotational/6mm lateral float, 13 or 17 degree release, self-cleaning double sided step in with wide entry area. XS Titan Carbon: carbon reinforced composite body, Ti spindles, aluminum spring axles. XS Carbon: carbon reinforced composite body, stainless spindles . XS: composite body, CrMo spindles . XL: women's specific MTB pedal with lighter spring tension and a wider range of tension adjustment