Woot offers Amazon Essentials Men's Slim Fit V-Neck Undershirt, Breathable Cotton, Pack of 6, Medium Grey Heather/Navy, Large or XL for $7.39 (orig. $15) + free shipping with Prime.

Product Description:

• SLIM FIT: Slim fit through the shoulders, sleeves, chest, and waist
• GARMENT LENGTH: 29" from side neck on US size Medium
• COTTON JERSEY: Soft, smooth cotton blend. This breathable lightweight fabric feels soft against your skin, while the added spandex offers a flexible fit that moves with you
• V-NECK UNDERSHIRT: A casual undershirt design, offering both comfort and functionality for everyday wear
• DETAILS: Designed with short-sleeves and a straight hem which are finished with super soft flexible stitching. The v-neck is banded for extra durability and has a printed label at the back neck
• Certified STANDARD 100 by OEKO-TEX, which requires textiles-based products to be tested against a list of 1,000+ chemicals, to limit those which may be harmful to human health