SAYSKY Combat Tops

The Combat tops are ideal for warm temperatures and race day since they’re incredibly lightweight, quick-drying, and very breathable. They are made with a waffle fabric construction, al- lowing for better airflow between the skin and fabric, making sure that the fabric clings less to your body and ultimately improves ventilation. Available as t-shirts, singlets, and tank tops with a slim fit.
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[@romrome]

I'm 5'5 at 155 lbs. I normally get a Men's small in Nike tops. What size should i get for Saysky Combat shirts?