Straight bundles are hair extensions or weaves made from human hair that has a straight texture. The hair is sourced from donors or collected from hair salons, and is then cleaned, treated, and wefted together into bundles. Straight hair bundles can be used to add length, volume, or color to natural hair, and are often sewn in or glued in. They can be styled and treated just like natural hair, and can be straightened or curled using heat tools.