My son is size 6 in shoes, he's 15 months old.. will the 12-24 fit?

Hello for the best size, see the chart below! ~The Burt's Bees Baby Support Team Foot Length Foot Width Get this SIZE 3.25" - 3.5" & 2" 3M 0 to 3 months 3.75" - 4.25" 2.5" 12M 3 to 12 months 4.5" - 5.25" 2.75" 24M 12 to 24 Months 5.25" - 6" 3 2T - 2T 2 to 3 Toddler 6" - 6.75" 3.25 4T-5T 4 to 5 Toddler

BPA is found in polycarbonate plastics and epoxy resins. These socks don’t appear to be made of either of those things.

Where is the cotton grown? Where are they manufactured?

Hi these are not made in the USA, they are made in China. At least the white/grey 12-24mo pack i bought are made in China.

What material are the grippers made of?

The Bee Gripper is a water-based foam that is applied to the foot of the sleeper and sleep and plays that when heated expands, once cooled the bubbles cool and build the foam. The material is recyclable and is GOTS approved and is Eco-Friendly. ~The Burt's Bees Baby Support Team