Why Do Even High-Quality Hair Extensions Get Tangled? Common causes include:Dryness: When hair loses moisture, the cuticles can lift and catch on one another.Friction: Friction from sleeping, backpack straps, collars, and clothing can cause tangling.Product buildup: Residue from styling products can make the hair feel rough and more prone to tangling.Solution: Keep the hair well moisturized with a leave-in conditioner and brush it regularly with an extension-friendly brush.