The Lloyd mats are OK but for nasty weather/winter use I like the Weathertech mats that go in my Carrera 4S (the Boxster stays inside when it snows.) They fit perfectly and hold water, dirt, etc. better to keep stuff from getting into the carpet.
http://www.weathertech.com/store/mvproduct.aspx?ItemGroupId=3&VehId=575&Year=2004