These baby joggers are perfect for babies in warmer climates who need comfy, easy to get into, easy to take off, flexible material for activities type of lifestyle! These joggers are not lined with the fuzzy keep warm kind of material - rather they are made of lightweight cotton polyester blend tha...t literally stretches- again, perfect for sweaty babies or babies who live in warmer climates and need a breathable pant. Love that the drawstring actually works to cinch waistband for best fit! Seem true to size/ maybe a tad short for tall babies. (My child is 9 months 29" 18 lbs 11oz- wears size 12m pants in ON) I always buy 1 size bigger for maximum wear considering grow into period :) HIGHLY RECOMMEND FOR ALL BABIES #sweepstakes