French terry, also known as summer sweat, is a stretchy fabric. Unlike other fabrics, it is not knitted or woven, but rather warp-knitted. This creates the typical looped texture on the inside. The fabric drapes softly and is very comfortable to wear; it is slightly firmer and has a better grip than jersey. French terry is perfect for sweatpants or hoodies.

Lycra is just another name or brand name for elastane. It's used to describe fabrics used in swimwear, sportswear, or dancewear. These are usually made of polyamide with an elastane content of 18 to 25 percent. This makes them very stretchy and conforms to the body shape.