When selecting the best materials for your athletic wear, it's important to consider the type of activity you'll be doing. For example, when running, you need materials that are lightweight, breathable, elastic, and moisture-wicking, like polyester, nylon, or spandex. You may also want materials that are reflective, windproof, or water-resistant depending on the weather and lighting conditions. For yoga, you need materials that are soft, stretchy, comfortable, and supportive such as cotton, bamboo, or spandex. You may also want materials that are natural, organic, or eco-friendly depending on your values and preferences. When skiing, you need materials that are warm, insulating, protective and durable such as wool, fleece or nylon. You may also want materials that are smart like phase-change materials to regulate your temperature or shape-memory materials to adapt to your body.