These shock-absorbent, vinyl-coated, foam strips of our closed-cell foam measure approximately 20” in length and 2” wide. We offer them in 2 thicknesses: ¼” and ½”. They are generally used to reduce circumference when an individual measures between 2 sizes. The ¼” will reduce circumference up to 1”, and the ½” will reduce circumference up to 2”. Just position and secure inside of the helmet, cutting desired length if needed, by peeling off the paper backing and applying. We suggest that you practice using scotch tape before adhering to ensure proper fit, as they are not meant to be repositioned. *Can be used to size Hensinger collars as well.