Icaridin (also known as Picaridin, Saltidin or Bayrepel) was developed as an alternative to DEET that is more pleasant to use - it is odourless, with a light, clean feel - and it doesn't damage synthetic fabrics which can be a problem with DEET sometimes. IR3535 is another alternative that is said to be as effective as DEET when both are used in low risk areas, but in more serious, disease infested environments DEET is still recommended by most authorities.