I used it in the cold green house this year after a number of losses last on what are normally hardy plants.it was in my case spread across the staging about 3 layers thick and it has kept the plants in better condition ,will certainly use next year,hopefully no more this winter.

Definitely a good investment, as Bjs says always double or treble the fleece. Don't forget to uncover during the day or frost free periods so as not to weigh the seedlings, plants down to much and shake off excess moisture as this can sometimes ice up and come in contact with the plants.

I have used single layer fleece bags on young acers this winter and they seem (fingers crossed) to have done the trick. Some 'dieback' but I expected that on acers. The only thing is that, if the wind can get inside the bags, they take off, so make sure your REALLY secure them. As Littlelegs says, make sure you take them off because the weight may just cause oddly shapes in young trees/shrubs. Also, shake off snow.

Thanks for the tips, especially using multiple layers and that excess moisture can cause ice close to the plants and shaking the snow off. I think I will have to give it a go next year, although I have heard we can expect more snow this winter.