These socks feature a tough spun-bond outer sleeve that has a durable heat sealed seam running its entire length. For the Maintenance and Chemical socks this tube is then filled with a next generation absorbent core that will absorb both oil-based and water-based fluids. The absorbent core is secured into the sleeve at each end with a durable plastic clip for the Chemical version and metal for the Maintenance and Oil only versions. The Oil only sock is filled with an absorbent polypropylene core that is made from recycled material. This core will absorb just oil-based fluids.