MedicineMan. What brand-colors are your grey tarps considered. In the middle pic thats further away they don't seem to be reflecting or whatever any colors from the surrounding. I read that up or down hill thread. Around here you have to take in account thermal drafts going up or down hill that changes. Usually up in mourning when warming up and down in the evening when cooling. Then the wind currents and drafts swirl around everywhere in these ravines. Makes it a pain to hunt critters.