Material, chest and arm vents, etc. But the neckline is INCREDIBLY BIG! It's a shame. What do you think of these. other than that they are great but this huge flaw will make it so that i will never buy them again. I find it very embarrassing that so much of my neck and shoulders are exposed. Too bad, otherwise good product. UPDATE: 02/20/20. So I bought a few more of these, despite my earlier statement not to do so. The neck hole problem seems to have been alleviated somewhat. However, the material seems a bit thin, which doesn't make me too happy. Still great fit. long and wide cut.
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