The coolest thing you can do (literally) to upgrade your baby’s stroller during the summer is get a terry liner. Switzerland-based Koeka makes great ones, but they are getting harder and harder to find in the U.S. The next best bet is American Terry’s new monogrammed terry-velour version ($58). For fall, we’re loving the new quilted liners and canopy covers from Mama-La and the mod graphic-print covers from Bonne Bonnets. You can also send in your own fabric to Couture Baby, who will create a custom canopy for your Bugaboo, or for preppy simplicity, just have Carriage Couture stitch your baby’s initials on your stroller canopy.