With warmer weather you may have noticed some new riding partners on the trails ... with wings.  It's not only mosquitos, but biting flies as well that can bleed you dry.  Lets take some time to review recommendations for protection from an expert, the Department of Defense.

1) On exposed skin, use deet, no specifically use Ultrathon Cream (33% Deet).  It's a formulation that doesn't wash off, prevents skin absorbtion and is time released.  One application can last 12 hours.

2) Treat clothes with a permethrin spray.  It permeates the fabric and can last multiple washings.

3) Keep a headnet handy in case things get really swarmy.  The Deet may prevent a mosquito from biting your eyeball, but it won't stop a hundred from hovering within an inch of your face and it's very hard to change flats with hundreds of mosquitos so close to you.

You can find an excellent selection of these products at the local outdoor stores (you know the ones I'm talking about).  You can also find aerosol Ultrathon there which would be the one insect repellant to choose if you could only choose one.