"Long sleeve shirt Filagen fabric, an innovative viscose fiber with collagen from marine fish scales, wears cool and comfortable, retains moisture, prevents unpleasant odors. Protects skin from sun rays, can be worn as a work shirt. -Men's Long Sleeve Shirt Regular Fit -Specially processed to help retain moisture and protect the wearer from red light. -The fabric suppresses the occurrence of unpleasant odors. -The fabric adjusts skin temperature to keep you cool and comfortable throughout wearing. -The collar design looks elegant even without a tie. -Properties do not disappear even through heating or more than 100 washes. -The shirt is durable to use with a needle. 14 SPI* * -SPI stands for Stitches Per Inch"