The 10' x 10' cover is made of sturdy materials and appeared to be well made. However, when using it to cover my 10' x 10' pool, I found that it was much too large and that it laid in the water instead of stretching across the top. Attempts at using the drawstrings to tighten the cover across the pool were in vain, and actually resulted in the cover splitting where the crawstrings come out. Great design, good material, just entirely too big for my size pool. I'd imagine it would work well with the 12'x 12' model.