Bullnose stair treads
This feature makes it so your stair tread rug wraps around the rim of each of your stairs to create an uninterrupted appearance. Stair tread rugs without this feature incorporate space between the edge of each tread and the edge of each stair.
UV stabilized stair treads
UV stabilized stair treads are treated to better resist the wear experienced from frequent and direct sun exposure. If your stairs are in a particularly sunny room or you'll be using stair treads outside, this is an important feature to secure the life of the product.
Binding tape
Check the quality of your stair tread rug by examining how it's bound. Quality pieces are bound with color matched binding tape or they're bound with yarn for a posher look.