Izzo Golf makes the best practice nets. They cost a little more, but they sure are quality. They fold up like a tent, and are easy to put up. They're not really meant for hitting the lofted clubs, but you'd be alright hitting 7 iron down to your driver with no problems.
Some of their models don't come with the tee or mat, but the tees are about 6 bucks for 3, different heights of course. The mat you can buy at your local hardware store for about 3 bucks for a square yard.
This would keep your muscles trained over the winter, but you'd still have to work on the short game come spring. There's really no way to train that without taking divots. That's pretty much a given.
Here's the link to Izzo's nets. They have a bunch of them.
http://www.izzo.com/practice_nets.asp?pnMenuOrder=1
R35