I've used nothing but W&N for the last 10 years. I do prewash my fabrics (unless they are pre-cuts and I use VERY few of them). I DO NOT prewash my batting. I also handquilt. I wash my quilts upon completion. Shrinkage is minimal. Does give the quilt the 'crinkled' or 'vintage' look - but I like that. So have all the recipients so far. I don't see any need to prewash any batting.