Here’s Birdies website description: Imagine a classic Birdies smoking slipper, and now make it a slide. We went there with the Phoebe. She takes an iconic silhouette but makes cozy an extreme sport, with slip-on design, seven-layers of comfort, and an over-the-top, faux-fur lining. And did we mention she’s velvet? •Classic slide (that’s secretly a slipper) •Made with vegan velvet + lined with faux fur •No-slip rubber sole for indoor + outdoor wear •7 layers of cloud-like comfort in every footbed •Slip-on with 15 mm heel No Box Included 3/4" heel; 1/2" platform (size 8.5) Textile upper/synthetic faux-fur lining/rubber sole