We Match! Keep Calm & Cruise On Adult T-Shirt - Great Matching Family Vacation Cruising Shirts! We Match! uses only high-quality fabrics for the best feel and durability. Premium heavyweight 6.1 ounce 100% cotton. Short sleeves. 6.1 oz., pre-shrunk 100% cotton (Dark Heather is 50/50 cotton/polyester Please see the images for the official We Match! size charts. The ones provided by Amazon are not accurate.