First of all these are so adorable. I use cloth diapers so they are a great way to keep your kids legs warm (in the cold months) and make diaper changes (and potty training) a cinch. However, we tried them on very hot summer days. They did seem to feel comfortable and did provide protection from the sun & bugs. I think they are more practical in the fall under dresses for playing vs. traditional tights.  My daughter is not a small toddler and they easily stretched to fit her. Overall I would not recommend these for the summer to protect from the sun as much because they still seem to "overheat" the child, but they are a cute accessory for when the temperature is lower.