The 5mm thickness is the critical spec here, as standard thin felt compresses under the weight of a heavy sliding door, allowing the glass seal to drop into the track. This beige pack offers a bulk quantity to cover the entire bottom rail without running out mid-installation.

Check the photo for the self-adhesive backing, which must bond firmly to the door frame or track edge to prevent the pad from sliding off during the first cold snap. If the adhesive fails, the felt will bunch up and create a new scraping hazard.

The 4-inch square format provides a larger contact area than round pads, which is essential for distributing the weight of a sliding door evenly across the track. This size prevents the door from tilting, a common cause of glass seal damage in winter drafts.

Look at the photo to confirm the felt is cuttable, as you may need to trim the edges to fit specific track profiles. A clean cut edge ensures the pad sits flush against the metal, preventing it from catching on the rollers.

With 648 pieces in assorted sizes, this pack allows you to match the exact diameter of your door’s bottom rail or the specific gap where the seal is failing. The round shape is ideal for fitting into the curved corners of many sliding door tracks.

In the product photo, verify the self-stick design, which should apply with minimal pressure. A weak adhesive will peel off when the door is pushed, leaving the glass seal exposed to the abrasive track surface.

The 3/8-inch diameter is small enough to fit into tight spaces where the sliding door’s seal contacts the track, such as the side guides or the bottom rail. This size is precise for preventing the glass from rubbing against the metal frame.

Examine the photo for the white color, which contrasts with dark tracks, making it easy to see if the pad has shifted. A shifted pad will no longer cushion the impact, leading to scratches on the glass seal.

The 3-inch or 75mm size is a standard dimension for many sliding door track protectors, offering a balance between coverage and flexibility. This size is large enough to support the door’s weight but small enough to navigate the track’s curves.

Look at the photo to see the brown color, which may blend with wooden door frames, making it less noticeable. However, ensure the felt is dense enough to resist compression, as a soft pad will flatten and lose its protective height.

The 3M self-adhesive backing is a key feature, as it provides a stronger bond than generic glues, ensuring the pad stays in place even when the door is moved frequently. This reliability is crucial for maintaining the gap between the glass seal and the track.

Check the photo for the round shape, which allows the pad to roll slightly if it shifts, reducing the risk of it getting stuck in the track. A stuck pad can jam the door, forcing the glass seal to scrape against the metal.

The 6×6 inch square size is larger than most door track pads, making it suitable for wider tracks or for covering multiple small gaps. The 2mm thickness is thinner than the 5mm pads, which may be better for tracks with limited clearance.

In the photo, note the black color, which is less visible on dark tracks but may show dust more readily. Ensure the non-slip backing is intact, as a slippery pad will slide out of position, leaving the glass seal unprotected.

The 199-piece count in assorted sizes offers flexibility for different parts of the sliding door, such as the top, bottom, and side guides. The brown color matches many wooden door frames, providing a discreet solution to the scraping problem.

Look at the photo to confirm the self-stick design, which should apply cleanly without bubbling. A bubbled adhesive will create a lumpy surface that can catch on the door’s rollers, causing uneven movement and seal damage.