The SQ Jersey ONE OX scores with the best, breathable materials & features: + pleasantly light + flexible & stretchy + 4-Way Stretch + lasered ventilation holes + perfect fit due to V-shape The mountain bike jersey is made of lightweight, breathable mesh fabric and keeps you cool even on hot days thanks to the laser-cut ventilation holes. The V-shape in combination with the flexible stretch ensures a good fit with and without protectors. The welded seams at the cuffs and hem provide additional wearing comfort.