Biomedical Innovations Tan Cloth Electrodes feature medical-grade non-woven polyester, coated with a high tack PSA (pressure sensitive adhesive). The material is designed for hot/cold and high humidity environments. The patented dual-layer technology provides optimal durability, longevity, and performance. It features a solid silver-coated carbon for even dispersion. Biomedical Electrodes are multi-use and hypoallergenic.