base layer
noun [ C ] uk/ˈbeɪs ˌleɪ.ər/ us/ˈbeɪs ˌleɪ.ɚ/
（保持身体干爽、温暖的）底衣
a piece of clothing worn under your other clothes, made of material that is designed to keep you warm and dry
When you are active in cold conditions, it is important that you wear a base layer that will draw sweat away from your body and keep you dry and warm. 在寒冷的环境下活动时，一定要穿上吸汗、干爽而且保暖的底衣。
- More examples
- These stylish base layers are exceptionally warm for their weight.
- Apparel companies are creating base layers that are thinner where you sweat more (under the arms and across the chest) and thicker in places that stretch out (elbows).
- We found the fabric so comfortable against our skin that we wore it as a base layer.
- Until recently, base layers tended to be synthetic, which made them effective at "wicking" sweat away from the skin but, after a while, smelly.