This is my Rubber Duck Bathroom Slippers Superfast knitting pattern.
Yes these really are designed for adults.
The knitting pattern provides full instructions for 3 adult sizes S (European size 31-35), M (European size 36-39) and L (European size 40-43).
These slippers are incredibly quick and easy to make because they use my Superfast technique which is 4 times faster than normal knitting.