This is a UNIQLO Heattech Extra Warm Cotton Waffle Crew Neck T-shirt. There's no stretching around the sleeves, wrists, or neckline, and it's still perfectly wearable. Please check the photos for the condition and only purchase if you understand that it is a used item. Please refrain from purchasing if you are overly concerned about minor details. It's great worn under sweaters or sweatshirts, and this Extra Warm Heattech is made of waffle material, so it looks good worn on its own. It doesn't look like typical underwear, making it easy to mix and match, and I highly recommend it. Thank you for looking.