Only Faith Men's Long Sleeve Silk Pajama Sleepwear Set Imitated silk fabrics Skin-closely,Breathable,no stimulation, silky soft and thin Long sleeve top with V-collar, front pocket Elastic waistband for comfort sizing Relaxed,roomy fit to ensure maximum comfort while lounging and sleeping Asain size,runs small.please check the size chart carefully and choose one size up if you not sure about it.