Better Thermal Insulator for Glass - Neoprene or Silicone?

[Loppyfoot]

I am looking to improve the thermal insulation on one of my favorite glass mugs.

I am choosing between a silicone glove or a neoprene wrap.

What is the difference between a silicone baking mat and silicone rubber?

Does silicone or neoprene have better thermal insulation?

 

[Bystander]

silicone or neoprene have better thermal insulation?

Not enough difference to notice. Either one foamed?