Interlock knit fabric is made by having two sides knitted together at the same time on one machine, remaining interlocked to be thicker than other knit fabrics. Also known as compound fabric or double-knit fabric, interlock fabrics have the tightest knit, giving them a smooth, soft surface that is stretchable, breathable & moisture-absorbent. These fabrics are perfect for loungewear, sportswear and even baby garments.