With a hot and humid summer in full swing, One Direction heartthrob Harry Styles decided to cool off by stripping down and going for a swim in a Boston lake.

Styles went shirtless while swimming with 1D's sound engineer, David Martell, before a performance at Mansfield's Comcast Center on Wednesday, June 26. The best part? There’s photographic evidence to prove it!

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Not only does Styles have a killer body (as you can see in the pic above), he also has a winning personality to match. He lived up to his sweet and lovable reputation by helping out a 19-year-old fan who fell down in the midst of an excited crowd who flocked to NYC’s Soho House today.

“As Harry was walking out this girl fell and then he helped her up and posed for a pic with her,” a source said.

Next up on 1D’s summer tour are a pair of shows at Nikon at Jones Beach Theater in Wantagh, N.Y. Click here to take a look at the full itinerary.