校服选择含棉织物的校服，因为这种校服具有以下特点：
School uniforms with cotton fabric are selected because they have the following characteristics:
1、吸湿性：棉纤维具有较好的吸湿性，在正常的情况下，纤维可向周围的大气中吸收水分，其含水率为8-10%，所以它接触人的皮肤，使人感到柔软而不僵硬。如果棉布湿度增大，周围温度较高，纤维中含的水分量会全部蒸发散去，使织物保持水平衡状态，使人感觉舒适。
1. Hygroscopicity: cotton fiber has good hygroscopicity. Under normal circumstances, the fiber can absorb water into the surrounding atmosphere, with a moisture content of 8-10%, so it contacts people's skin and makes people feel soft but not stiff. If the humidity of cotton cloth increases and the surrounding temperature is high, all the water content in the fiber will evaporate and disperse, so as to keep the fabric in water balance and make people feel comfortable.
2、保湿性：由于棉纤维是热和电的不良导体，热传导系数极低，又因棉纤维本身具有多孔性，弹性高优点，纤维之间能积存大量空气，空气又是热和电的不良导体，所以，纯棉纤维纺织品具有良好的保湿性,穿着纯棉织品服装使人感觉到温暖。

2. Moisture retention: because cotton fiber is a bad conductor of heat and electricity, the thermal conductivity is very low, and because cotton fiber itself has the advantages of porosity and high elasticity, a large amount of air can be accumulated between fibers, and air is a bad conductor of heat and electricity, pure cotton fiber textiles have good moisture retention, and people feel warm wearing pure cotton fabrics and clothes.
3、耐热性：纯棉织品耐热能良好，在摄氏110℃以下时,只会引起织物上水分蒸发,不会损伤纤维,所以纯棉织物在常温下,穿着使用,洗涤印染等对织品都无影响,由此对提高了纯棉织品耐洗耐穿服用性能。
3. Heat resistance: pure cotton fabric has good heat resistance. When the temperature is below 110 ℃, it will only cause water evaporation on the fabric and will not damage the fiber. Therefore, the wearing, washing, printing and dyeing of pure cotton fabric at room temperature have no impact on the fabric, which improves the washing, wearing and wearing performance of pure cotton fabric.
4、耐碱性：棉纤维对碱的抵抗能力较大，棉纤维在碱溶液中，纤维不发生破坏现象，该性能有利于服用后对污染的洗涤，消毒除质，同时也可以对纯棉纺织品进行染色、印花及各种工艺加工，以产生更多棉织新品种。
4. Alkali resistance: cotton fiber has great resistance to alkali. When cotton fiber is in alkali solution, the fiber will not be damaged. This performance is conducive to the washing, disinfection and quality removal of pollution after taking. At the same time, it can also dye, print and process pure cotton textiles, so as to produce more new cotton varieties.
5、卫生性：棉纤维是天然纤维，其主要成分是纤维素，还有少量的蜡状物质和含氮物与果胶质。纯棉织物经多方面查验和实践，织品与肌肤接触无任何刺激，无负作用，久穿对人体有益无害，卫生性能良好。
5. Hygiene: cotton fiber is a natural fiber. Its main component is cellulose, as well as a small amount of waxy substances, nitrogen-containing substances and pectin. The pure cotton fabric has been inspected and practiced in many aspects. The contact between the fabric and the skin has no stimulation and negative effect. It is beneficial and harmless to the human body for a long time, and has good hygienic performance.
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