The Cluggette incorporates all of the UGG signature comforts and luxuries. Crafted from UGG signature sheepskin and finished with a plush collar, this slipper features a lightweight, cushioning sole so you can keep feet cozy in and out of the house. Tag says 8 US - 39 EU. I wear an 8 and these are big. EU 39 is a US 9. Twinface. Great for both indoor and outdoor use. Water-resistant suede upper. Easy slip-on style. Fully lined with UGGpure™. Memory foam insole. Textured EVA outsole.