Foam dewars are designed for the storage of liquid nitrogen. Foam dewars far superior to glass dewars and therefore we don't even carry glass dewars. What makes them better?
Insulation: Foam dewars have superior insulation when compared to traditional dewars, which saves refilling costs and time.
Durability: Since these dewars are made from high density they are nearly indestructible when compared to traditional glass dewars. No need to worry about these dewars breaking if they are knocked off of a lab bench.
Design: Foam dewars are made with stable bases and with handles for easy transportation.
Cost: Foam dewars when compared to traditional glass dewars of a similar size are about half the price.