So I'm headed to the Cascades this July to get some glacier experience on Mount Baker. The class I'm taking requires plastic double boots so a few months back I went over to the Adventure 16 in West LA and picked myself up a pair of Lowa Civetta Extremes...tried on tons, but the Lowa's just fit the best and felt the best to walk around in. Long story short, I've taken them out on mixed terrain in the Sierra this past winter and spring and they're starting to show some wear. I've never owned a pair of plastics, just wondering if there are any tips from the gear gurus out there on keeping them looking and performing like new for as long as possible, cuz they aren't exactly a cheap piece of gear. Thanks in advance!