Not sure what it's used for as it's VERY thin and transparent. Another buyer posted pictures and they are very accurate. I know they won. Won't last a few washes as some shirts have threads sticking out. Unless you have a specific reason for polypropylene I wouldn't get it, it's like any nylon shirt. I can't tell you anything about the size because I didn't try the product after looking at it, so I sent it back straight away. I work in the cold and I suggest: https://www.amazon.com/Russell-Performance-Baselayer-Thermal-Bottom/dp/B015QSMDTQ/ref=sr_1_5?ie=UTF8&qid=1549127263&sr=8-5&keywords=russell%2Bthermals % 2Bfor %2Bmen&th=1&psc=1https://www.amazon.com/Russell-Performance-Tech-Baselayer-Thermal/dp/B01BNB1DLO/ref=pd_sbs_193_3/147-0567142 -8021154?_encoding=UTF8&pd_rd_i=B01BNBe1EMW&pd_rd_r0002c9d000 -9e3c-7da984d71310&pd_rd_w = 57Oxj&pd_rd_wg=CVOHg&pf_rd_p=588939de-d3f8-42f1-a3d8-d556eae5797d&pf_rd _r=9GZDT9DGYT260QW9CCA0&refRID=9GZDT9DGYT260QW9CCA0&th=1&psc=1ORhttps://www.amazon.com/Duofold-Heavy-Weight-Double-Thermal/dp/B006SRT0V4/ ref=sr_1_8? ie =UTF8&qid=2rofold&words-1549127558 27s%2Bthermal%2Bunderwear&th=1&psc=1https://www.amazon.com/Duofold-Weight-Double-Thermal-Medium/dp/B006SRT0FA/ref=sr_1_9?ie=UTF8&qid =1549127559&sr=8 - 9&keywords=duofold%2Bmen%27s%2Bthermal%2Underwear&th=1&psc=1https://www.amazon.com/dp/B07HRR2MXY/ref=emc_b_5_i
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