Key takeaways
- Classic Ugg boots are true to size and start snug.
- The wool lining compresses with wear, so a snug start is correct.
- Size down if you fall between sizes.
- Slippers run roomier and waterproof styles run tighter.
Uggs are bought for warmth and comfort, and the sizing trips up more people than any other part of the purchase. The answer depends on which style you are holding.
Classic boots fit true to size and feel snug at first
Classic Ugg boots are made with soft sheepskin and a plush wool lining that fits closely on the first wear. That snugness makes them feel small at the start. The lining compresses over the following weeks and settles into a roomier fit, so a boot that feels slightly tight on day one is usually the correct size.
Slippers and open-back styles run larger
Open-back Ugg slippers have less structure holding the foot, so they feel roomier straight out of the box. Some men's styles are also cut with extra volume to accommodate thicker socks.
Waterproof models run tighter
Waterproof construction adds protective layers between your foot and the outside, and that volume comes out of the interior. Sizing up is worth considering for waterproof styles, particularly if you wear thick socks in winter.
Three steps get you the right size
- Measure and check the chart. Ugg publishes sizing per style, and the variation between styles is larger than people expect.
- Size down between sizes. The wool lining will compress, so the smaller size ends up correct.
- Try them on in the socks you will wear. A thick winter sock changes the fit more than half a size.
How the popular styles compare
- Classic boots: true to size, snug at the start, roomier after a few weeks.
- Slippers: roomier because of the open back, and better suited to lounging than walking.
- Waterproof styles: tighter through the foot, so consider sizing up with thick socks.
Our fitters measure both feet and check the fit in the actual style you want. Sizing charts cannot tell you how a lining will compress on your foot.
