Unbleached cotton webbing, known as twill, has a V-shaped design with the point of the V in the centre. Made of 100% natural cotton fibres, these thick, strong straps cannot be cut when hot. Hemming can be done. It must be ensured that if the strap is used with a buckle, the extra thickness created does not prevent it from functioning properly. If this is not the case, then heat-cut synthetic webbing should be used. These can be purchased by the metre or in rolls of 100 metres.