3Bird Whetstone ShirtThe relaxed fit and pure lived in feel of our Whetstone Wool Shirt make it hard to resist wearing every day. Crafted with a fine lightweight wool, its next to skin softness is memorable and a hint of Spandex gives it just the right amount of stretch for easy wear and limitless function. Travel with it, don it for dinner, dress it up for a meeting the challenge will be finding a time you can't wear it. 69% wool, 29% polyester, 2% spandex (275gsm 8.