Provided are elastomeric compositions, such as a tire innerliner,
comprising at least one isobutylene based elastomer and at least one
hydrocarbon fluid additive ("HFA"). The compositions have improved cold
temperature properties and are particularly useful as tire innerliners
for an aircraft tire. The use of a HFA in the elastomeric composition may
allow for the use of reduced amounts of secondary elastomers, such as
natural rubber, while allowing for an improved balance in the
composition's brittleness and permeability properties. Examples of useful
HFAs include polyalphaolefins, high purity hydrocarbon fluids, and water
white group III mineral oils.