Look at the offerings of Russell Moccasin Co., in Berlin,Wisconsin, purveyors of bespoke boots and shoes of all sorts, including many designed for rigorous and hot conditions as encountered on southern African safaris, and American deserts. Among their options are thornproof linings, "breathable" canvas uppers, toe guard reinforcements, and etc., all of utility to desert operators... None of this is cheap, all of it is first rate and mostly custom-made, with prices and lead times to match. The Merrell "Ventilator" line of light duty boots and trail shoes are about as comfortable as can be had for casual use, but are little more than glorified sneakers, compared to real boots, and once, quite quickly, worn out, are throw-aways, whereas, a properly maintained pair of Russell boots can be resoled, restored, and probably argued over by your heirs...