OK, if you are getting these for your man, good job, he's going to love them. However, if said mans feet sweat, and/or produce any type of odor, heed my words or else you are going to have a couple of SCUD missiles laying on the floor in your house in a couple of months. "Oh my GOD!!! Ewwwww!!!!" blah, blah, blah, calm down lady and listen. OK, when/if the stench factor on these little puppies reaches critical, follow my simple and tested procedure for defunkification
1. Don appropriate personal protective gear and rip out original insoles. "But they're glued in, wahhhhh!!!!" I know there glued in, stop being a baby and rip em out! "But they're ripping, wahhhh!" I know they're ripping, just get em out! It will be fine I promise. Jeez you whine a lot.
2. Not that you got these godless, disgusting heathens out, you will be inclined to throw them out, DON'T!!! Throw em in the washing machine with hot water, and allow to air dry. Congratulations, you now have a spare set.
3. Take your new insoles you bought from Ugg and closely inspect them. You will see where they attach to the actual sheep hide. Now, take a razor and cut the stitching carefully and begin to work the hide from all the other useless material that won't fit in the slipper. If this is too hard for you, you shouldn't be sucking air, please leave the planet.
4. When done, place new, clean insole in the slipper and guess what....your done. You effectively neutralized the biological threat living in your house. You're so smart and good. You deserve a candy bar.....unless you're fat.  In that case I recommend a glass of water.