RedactedNarrative: Vessel 1 Operator launched his 10' sit-on top kayak on Lake Winnebago.  He paddled south to approximately 100 yards west of Subway Road and turned back north due to the winds picking up from the west.  At approximately 2:45 pm Vessel 1 Operator was attempting to paddle north, back towards the wayside landing.  He was pushed away from shore by the wind.  The waves began to get larger and the kayak overturned.  Vessel 1 Operator was able to get back onto the kayak but was ejected back into the water several more times due to the waves.  Operator was wearing shorts and a light shirt and did not have a PFD with.  A witness from shore called 911 .  First responders were able to reach Vessel 1 Operator and retrieved him from the water at approximately 3:30 pm.  He was transported to the hospital where he was treated and released for cold exposure and hypothermia.  Operator reported to the officer that he has ongoing medical issues due to the exposure.