Basically, you want to look at the material tech first. Most of these custom-fit ones use TPE (thermoplastic elastomer) which is like a hard rubber, while others use XPE which has a layered, foam-like structure. Honestly, idk if the $300 price tag is always worth it, but I've heard the wall height is the most important technical factor for keeping gunk off your carpets. Wait, I mean, you also gotta look at:
- The backing texture (does it have that 'velcro' grip so it won't slide and mess with your pedals?)
- How the edges are reinforced so they don't curl over time
- The depth of the drainage channels so water doesn't pool under your feet Your basically choosing between a 'bucket' style that holds a ton of liquid and a flatter design that's easier to spray off. Before you decide, are you living somewhere with heavy salted snow, or is it more for just rain and mud? Also, how often do you plan on taking them out to wash?

Building on the earlier suggestion about wall height, I spent way too much time obsessing over the technical specs for my own Model 3. My experience was that not all TPE is created equal... some of the cheaper ones I tried initially felt really plastic-y and didnt grip the floor well at all. You really want to be careful with the fitment around the accelerator pedal especially. A few technical things I noticed during my trial and error:

• The underside texture matters more than youd think so it doesnt slide and bunch up.
• Lip height is definitely key, but make sure the material is stiff enough to hold its shape when youre pulling it out full of water.
• Coverage on the dead pedal area is a huge pain point if you live somewhere with salt or snow. Just to narrow things down a bit:
• Are you looking for something that has a more premium fabric look or are you okay with the rugged rubberized aesthetic?
• How often are you planning to pull them out for a deep clean vs just a quick vacuum? Checking the corner seams is also worth it since some brands have weak points there.