Heavy material 

55/45 - hemp fiber/organic cotton blend

Hemp protects your skin by naturally filtering UV light. Hemp resists bacterial growth and breathes excellently, preventing odors. Hemp has four times the strength of cotton; It won't weaken when washed. Hemp retains color better than any other fabric.

Organic cotton refers to naturally cultivated cotton without the use of any synthetic agricultural chemicals such as fertilizers or pesticides or transgenic technology.