Inclusion Criteria:  Men and women between the ages of 18-28 years been cleared by the medical monitor for this study Must perform aerobic exercise for 150 minutes per week.  Exclusion Criteria:.  Have a current musculoskeletal injury that would limit their physical activity or preclude the participant from walking, jogging, running, sprinting, or cutting. Chronic health problems that affect your ability to thermoregulate (disorders affecting the liver, kidneys or the ability to sweat normally) Fever or current illness at the time of testing History of cardiovascular, metabolic, respiratory disease, peripheral arterial disease, or coagulopathy Current musculoskeletal injury that limits their physical activity Currently taking a medication that is known to influence body temperature or blood flow (amphetamines, antihypertensives, anticholinergics, acetaminophen, diuretics, NSAIDs, aspirin, vasoactive medications) Have a history of heat related illness Have a history of cold urticaria (i.e. allergy to the cold) and/or Raynaud's phenomenon [disorder that causes decreased blood flow to peripheral body parts (e.g. fingers and toes)] Currently smoking (cigarettes, vaporizers, e-cigarettes)