Floor type: If you have hardwood, tile, or laminate, look for a chair mat designed for hard floors, typically with a smooth backing. For carpeted floors, choose a mat with small studs on the bottom to keep it securely in place. Size: Measure the area where your chair moves most and select a mat that covers enough space. Larger mats are great for wider ranges of movement, while smaller mats are perfect for tight workspaces. Shape: Chair mats come in various shapes—rectangular, square, or even lip-shaped mats that fit neatly under desks. Pick one that works best with your desk layout. Material: Look for durable materials like polycarbonate or PVC that can handle daily use without cracking or bending. Clear mats are popular for letting your floors show through while providing protection.