These hats started out as a great way to use my knit fabric scraps. Now I am wanting to add them to baby shower gift sets. That will come soon enough! These are lightweight, and breathe very well. Perfect for baby during the cool (not cold) and warmer months. Here in Central NC that would be Spring-Fall, and possibly half of our winter as well. Just like all of my products, these are safe for both the washer and dryer. If the knot comes undone, it is okay! The hat was sewn before adding the knot.