Cotton is a much cooler fibre to wear than Polyester in the hot Summer Months.  New arrivals: Long Sleeve and Short Sleeve HiVis Cotton Polo shirts with cotton Mesh underarms for further ventilation, or perhaps you prefer a button up shirt, Bisley and Winning Spirit offer a great HiVis Cotton Button up shirt with Mesh vents.  No matter what you are doing, Cotton will keep you cooler for longer.  Don't hesitate to contact our friendly team members if you cannot find what you are looking for. Ciao