WE'VE SLIGHTLY ADJUSTED THE SHORT SLEEVE JERSEYS FOR 2024. THEY WILL BE SLIGHTLY SLIMMER THAN YOUR CURRENT SHORT SLEEVE - MORE LIKE THE GRAVITY AND 3/4 SLEEVE JERSEYS.WE'RE NOW CALLING THE SS A STANDARD FIT INSTEAD OF LOOSE.MADE FROM 100% RECYCLED POLYESTER. THE FABRIC IS BREATHABLE AND WICKING BUT NICE AND RESISTANT TO HOLD UP ON THE TRAILS.