Mack Weldon 18-Hour Jersey Crew Neck Undershirt Bright White Mack Weldon 18-Hour Jersey Crew Neck Undershirt in Bright White offers superior comfort for all-day wear. Crafted from a premium blend of modal, cotton, and spandex, this soft jersey tee provides a breathable feel with just the right amount of stretch. The classic crew neck design and clean silhouette make it an essential base layer or a standalone staple for a minimalist wardrobe. High-quality construction ensures it maintains its shape and softness wash after wash. #Undershirt