Jamie Perfect for winter months - Exactly what I was looking for! Very light fabric and SO soft!! My son is 4.5months but is a big boy (18lbs and in 6-9month clothing) and the size 6-12 month in these booties work great. The material is kind of stretchy so I can make the straps plenty tight and still have room to grow. There’s gripper strips on the bottom but I doubt the traction is great on wood/tile if you have a walker. For infant/crawler stage, these are absolutely perfect.