Better Than Expected
I purchased these to wear in unheated huts after a day of winter hiking. I was pleased to discover the inside sole of the slipper was padded; other brands I tried were not or didn't have nearly as much. The sizing is true to size, however, I bought a size up to accomodate my bulky winter hiking socks. The mediums would have fit fine with regular socks but the large fit well with the thick socks - just a little big. I wear a size 8. They are very warm and cozy, light weight, and easy to compress down and stuff in a backpack.

Comfy and warm
I bought the bootie version for my daughter and the moccasins for myself. She wears hers everywhere! Extremely comfortable and warm. The soles are water resistant and have these no-slip dots on the bottom which sets them apart from other down booties I have worn which tends to be a little slippery. My only complaint, the opening is a little small for my size 12 foot; the heel loop ripped off the first time I tried to pull one on too forcefully. No big deal though, I would absolutely by these again.

Sierra Designs Women's Down Moccasins
I was a little disappointed, they come looking a bit different then pictured. However, overall liked these slippers very well. They do run a bit small, I wear a size 8 so I ordered the Large ( 8.5-9.5) and my toe was right at the very end of the slipper with no room what so ever. So I ordered the next size up, which was the XL (10-11) and they were HUGE!

poorly made
1. The heel pull tab on the left slipper came loose on the first pull. 2. The right slipper feels too tight. 3. The stiff sole is too wide under the arch, giving an awkward shape and feel. At half the price this pair would be a good deal. Unless you want a stiff sole, opt for the similar but less expensive model "Sierra Designs down packable booties". I'd have bought them if they'd been in stock in my size at the time I placed the order.