它有双层防风罩和固定绑带，100%保暖涤纶，绝对保温！ 并且头大的话，耳罩可以调整。

They have double layer wind-resistant shell and binding, feature 100% Polyester Thermolite for great insulation and they are adjustable in case you have a huge noggin.

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除了人民的车，其他新款帽衫都是拉链设计。帽子采用了双层面料设计，更加舒适保暖。

All new designs, except for the People's Vehicle, feature a full-front zipper. The inside of the hood is double-layered for extra comfort and warmth.

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文章借助物理学热传导理论，建立数学模型解释多层窗户比单层窗户保暖的原理，探讨在有限的建筑材料规定下保温效果最佳时双层玻璃之间的距离与厚度之间的数量比。

The paper establishes the mathematic model to explain the principle that the multi-tier windows can preserve more heat than the mono-tier one with the help of conducting heat theory in physics.

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