Semi-custom is roughly what the haberdashers call “off-the-rack”. Like a 42 Long at The Men's Warehouse, a semi-custom mat can fit many different cars, truck or SUV, despite variations in floorboard size. It is not one size fits all, however. Because there are only so many variations in vehicle floor pans, semi-custom floor mats, like Husky floor mats, come in up to 50 patterns and can get you 90-95% fit. Just like a 42 Long.