Drill is stout durable cotton fabric with a strong bias in the weave. It can be used unbleached, although it is more often bleached or dyed cotton drill is quite the versatile material. Not only is this type of cotton fabric incredibly strong and durable, but it also comes in an incredible number of colours. A cotton drill fabric is manufactured with a so-called twill weave. The twill weave gives the cotton quite the unique look, but it also adds strength to the fabric itself. It also makes the cotton fabric a little heavier, which makes cotton drill more suitable for anyone who is looking for medium to heavier weighted fabrics. The fabric can heavily resemble denim, although the feel of the material is smoother. In conclusion, cotton drill is perfect for durability and sturdiness, while retaining some of the comforts associated with cotton.