The basics The longest-lasting hypoallergenic, medical grade tape we’ve ever seen. The benefits Pro-Flex II is a very popular hypoallergenic tape. It’s made with Urethane which gives it a very flexible and comfortable bond. The uses Very little residue is left after removal. It also has very little shine, making it great for all types of hair systems. The bottom line This tape is also very popular with our hair extension customers. The liner is white but the actual tape is clear.