Hi Jeff, 
    
    I don't think that anything woven into a base layer would give you
    enough support for your knees.  I really think you would get more
    support from a real brace.   
    
    

I have been
    wearing this knee brace from a company called 
Mueller for
    many years, purely as prevention against injuries.  I didn't really
    need a knee brace but I was wearing it just in case.  I purchased
    the knee brace at a Walgreens pharmacy for around $30 or $35. 
    
    You wear it over your base layer, but under your pants, so nobody
    even knows you are wearing a brace. It is held in place with two
    velcro straps, one above the knee and one below the knee.  It goes
    on and off very easily and quickly.  Attached is a photo.
     
    You might also be interested in a series of articles about knees,
    injuries, treatments, and more, that were originally published in
    separate sements in Lift Lines (our newsletter). Several of our
    members contributed their experiences.  In the end, we put all these
    segments together into a several pages long booklet and posted it on
    our website.  You can find it on our ARTICLES page at: 
http://www.mthigh.org/Articles.htm
    .  See it under "Safety".  It is item 12 on the list of safety
    articles.  It includes a section about knee braces.
    
    Or, if you prefer, go directly to that article by following this
    link:  
http://www.mthigh.org/Articles/Knee-Treatments.pdf
     
    Emilio