THE MENS GRAVITY JERSEY IS A STANDARD FIT.THEY ARE MADE TO FIT LIKE YOUR FAV SHIRT AND WORK FOR MOST BODY TYPES. IF YOU WEAR WITH BODY ARMOUR WE COULD SUGGEST SIZING UP.MADE FROM 100% RECYCLED POLYESTER. THE FABRIC IS BREATHABLE AND WICKING BUT NICE AND RESISTANT TO HOLD UP ON THE TRAILS.