S-Lab Sense Ultra 8L Hydration Vest Size XL Used, but in perfect working condition Built specifically for ultra races, the S-Lab Sense Ultra Vest provides rest-assured storage for all of your race day necessities and easy hydration. The vest features a lightweight and breathable material that wicks moisture, dries quickly, and promotes ventilation so you stay comfortable as you navigate the bound-to-happen exhaustion, endless obstacles, and grueling steeps. Two front pockets for soft flasks provide quick and easy access to on-the-go hydration, while multiple storage pockets keep items lightweight rain shell, gloves, headlamp, and fuel close at hand. .