https://www.amazon.com/gp/product/B077XPTWH5/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

强烈推荐这一款。用了三年了。大，厚重，不滑。做mountain climber 时不会把垫子推走。做 crunch 时不硌腰。做plank 时不硌肘。堪称完美！