What is the coil gauge of the coils in the Micro-Coil Mattress Topper? May 12, 2023 14:54 Updated The recycled steel coils in our micro-coil topper are 18 gauge. Related articles What is the coil count in the Micro-Coil Mattress Topper? What is Cradle to Cradle® GOLD Certified™? What are the differences between a mattress topper, mattress pad, and mattress protector? Do you have a referral program?