A track assembly comprises an inner channel member and an outer channel member, the outer channel member having opposing flanges with a conduit for receiving an air line for operating the assembly. The bleed air slot includes an inlet having a first area radially inward of an outlet having a second area with the second area being greater than the first area. The resin comprises a recurring unit of the following formula, 1wherein R1 is typically a hydrogen atom and the C 3 structure is a 2-methyl-2-tricyclodecanyl group, 2-ethyl-2-tricyclodecanyl group, 2-methyl-2-adamantyl group, 2-ethyl-2-adamantyl group, 1-methylcyclopentyl group, 1-ethylcyclopentyl group, 1-methylcyclohexyl group, or 1-ethylcyclohexyl group. The area including the indentation is at least greater than an area where comes in contact with the face of an occupant.