Our heavyweight fit (classic) t-shirts are made from 6.1 oz 100% cotton which is ideal for comfort, breathability, and durability. This is a low end heavyweight t-shirt making this suitable for year around usage. The heavyweight fit is a comfortable and versatile fit that is neither too tight nor too loose, making it suitable for a variety of body types similar to the regular fit t-shirts. These shirts do not have a side seam instead have a more tubular design.