Design Philosophy Mt500 Burner Jerseys Have A Reputation That's Hard Won And Well Deserved - Built For Hard Riding In The Toughest Of Mountain Terrains. Multi-Fabric Construction. Fabric Selection And Panel Design Are The Key To This Jersey's Success. The Sleeves And Shoulders Are Constructed From A Tough, Extra Durable Fabric For Those High Wear Zones Whereas The Main Body Uses A Rapid Wick Material That Helps Keep You Dry And Cool. Strategically Placed Stretch Panels Have Been Included To Give Unrestricted Movement On Your Bike Fit. The Mt500 Burner L/S Jersey Has A Loose, Relaxed Fit Which Makes It Compatible With Elbow And Body Protection. 90 Day Satisfaction Guarantee. So Confident Are We In This Product That, If You Are Not Entirely Satisfied With It Then We Offer A No-Quibble Refund Or Replacement Policy Within 90 Days Of Purchase.