My son had just turned 8mo and I decided it was time to upgrade from a previous ergo sack. I have the long sleeved one (3.5) and a sleeveless (2.5). The long sleeve is for home and the short sleeve is for daycare. I keep my house at 71 at night & I live in Nebraska so the winter is fairly cold. Not Alaska or Minnesota cold, but it's cold lol Anyways, the sack washes & dries beautifully. I used to hang these to dry, but I started drying them & they have not shrank or pilled. Additionally, the sleeveless sackswere too cold at night bc even with socks for gloves, his hands were getting cold. I did not like the leg convertible sacks bc the zipper only zips down halfway which is not ideal for middle of the night diaper changes, if applicable. This sack in particular is extremely soft & feels thick. It's literally a blanket that fits him perfectly. It's slimmer than previous sacks I've purchased which is a good thing bc he stays warmer. It's nice and long, too. I just wish there were more color patterns like stripes, triangles, circles, and other geometric patterns. Even animals would be super cute. A+ on this sack. It's of high quality, too. No stitching coming loose, no fading after a dozen washes with drying. No shrinkage that ai noticed. Get it!!