SL100 Features: -Easy to lay, latch and cut. -Fine-celled, extruded polystyrene foam. -Offers excellent thermal insulation as well as excellent impact (transmitted). -In-room (reflective) sound insulation with a IIC 69 STC 66 rating. Generic Dimensions: -Roll size: 4' W x 25' L. -Thickness: 2 mm. Dimensions: Overall Product Weight: -3.5 Pounds.