How does Sawyer Stay-Put Sunscreen resist sweat?
Your skin has many layers of cells from the base (basal level) to the top. Theses cells are constructed like the Grand Canyon on a micro scale. That is how sweat can be generated at the lowest levels and pass to the top.
Sawyer’s Stay-Put sunscreens use a special technology to bond the rayabsorbing agents to the sidewalls of the canyon. Sweat and water pass over the compounds without flushing them away. This makes the formulas highly resistant to deterioration due to sweating or swimming, while remaining comfortable to wear.
Can I apply Stay-Put sunscreen while I am hot and sweating?
Sawyer recommends that you apply Stay-Put SPF 30 to dry, cool skin for maximum effectiveness.