For shipping t's, is foam as in padding liek foam ok for lining a box for shipping or do you have to use styrofoam for insulation? Ive tried with some spare foam and the box is solid and would be fine physically, but my main concern is i think stryrofoam is an isulator and im not sure how much it would help with the weather compared to normal foam. I would think styrofoam box would soon have the interior temperature equal the exterior temp, but im not sure if it will delay the heat that long.