This is a long-sleeved Dry Layer from Finetrack. The long sleeves help prevent chilling from sweat on your arms. Color: Black Size: M (Men's) Length: Approximately 65cm Width: Approximately 37cm Shoulder width: Approximately 38cm Sleeve length: Approximately 57cm Used about twice, but there is no noticeable damage. However, this is a USED item, so please refrain from purchasing if you are sensitive to such things. The following is quoted from the web page: ■ Don't give up and think "you sweat, it can't be helped." During mountain climbing, where you can't change clothes frequently even if you sweat a lot, you need to deal with sweat while wearing your clothes. Skin Mesh uses mesh holes that allow sweat to pass through and a water-repellent effect to smoothly remove sweat from the skin, reducing the clinging of clothing and stickiness on the skin. It also has the effect of suppressing odors by keeping the skin dry. The extremely thin and soft mesh fabric fits gently against the skin with zero tightness. Designed to be worn for long periods during mountain climbing, it doesn't get stuffy even when you sweat, and keeps you feeling like you're not wearing anything. Change your usual underwear to mountain-specific underwear. If you focus on choosing underwear that doesn't constrict or cause stress, mountain climbing should become more comfortable. Sweat chilling is a problem unique to mountain climbing, where you continue to act for long periods without changing your clothes. "Sweat chilling," which occurs when sweat that has wet the skin cools down, prevents the body from warming up easily even when wearing cold-weather clothing or outerwear if the wet clothing remains in contact with the skin. Wearing Skin Mesh keeps the skin dry and reduces sweat chilling. Material: 100% polyester Country of origin: Japan Suitable for all outdoor activities Mountaineering / Trekking / Trail Running / Cycling / Skiing / Snowboarding / Backcountry