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If you are buying your glasses for a specific sport, such as cycling, this should be easy for you; however, if you plan to use these glasses for a variety of sports then you need to consider what demands and expectations you will place upon this product. Try to think of it in terms of percentages: I will use these glasses 50% for running, 10% for boating, and 40% for leisure. Are you playing a sport where weight matters? If this is the case, then you will need to go with a lighter frame. Do you expect your glasses to fall on the ground at least once? Then you need a frame that can withstand some 'abuse.' Do you care about cost? If so, your frame choice may be more limited. The standard plastic frame is a cheaper option. It is a bit heavier and less aerodynamic; however, a well-made plastic frame can last for quite a while. Acetate is a plant-based frame material that mimics traditional plastic. Its layered construction creates a strong frame that is usually rather lightweight. If you are concerned about the environmental impact of your purchase, you may want to go with a castor frame, which is made from castor plants. These frames possess similar qualities to acetate ones with the added benefit of being eco-friendly. For the ultimate in flexibility, look into a nylon or nylon-hybrid frame. These frames are designed for sport and can bend yet retain their original shape. Traditional nylon frames are also cheaper than a hybrid option. Metal frames are not usually chosen for sports as they offer less flexibility and can potentially cause injury when broken. If you do decide to go with metal you will most likely need to choose between aluminum, titanium, and stainless steel. This type has a head-hugging design that allows for less light to penetrate inside the frame. It also tends to grip your head tighter resulting in less movement, even when participating in a sports activity. Some sport sunglasses also have a foam insert that allows you to have extra seal/coverage for sports, offering wind protection too. Wraparound sunglasses generally have a higher 'base curve' meaning that they follow the angles of your face closely. Standard non-sport sunglasses generally have a shallower 'base curve' as they draw away from your face and let additional light in. Note that if you have a high prescription you are at greater risk of having troubles adapting to glasses with a high base curve. If you are participating in a sport that requires other head gear, such as a helmet, you need to consider how your sunglasses with work with, or against, these other items. Ideally, everything that you wear should function together to provide you with maximum safety, performance, and comfort. For example, if you are a cyclist, your new sunglasses will need to fit well with your helmet. If you are a motorcyclist, you need sunglasses that fit under your face-shield or act as independent protection with an open-faced helmet. To ensure the proper fit, it is probably a good idea to bring your helmet or other gear with you when trying on your sunglasses. Move your head around to check for motion. Look out from all angles to check for an obstructed view. Layers upon layers of gear can make things hot. Don't forget to consider how much ventilation your sunglasses will provide. Some of the most protective pairs can also feel rather smothering in higher temperatures. If you are participating in a watersport, investing in a floating frame might be a very good idea. These frames are made of lightweight material and are designed to stay on the surface of water (usually for quite a while) after falling off. When you think of UV ray protection, special lenses probably come to mind; however, in snow sports, UV rays can reflect off snow and infiltrate the gaps in frames. Specialized frames designed for high-altitude sports minimize this damage by including shields on the side and over the bridge of your nose. The shields can actually improve your ability to look around without facing glare. High altitudes are another consideration for additional awareness of UV exposure as the higher you go, the thinner the atmosphere, and greater the UV exposure.

summary: Think about where you will wear them. Consider the frame material. Understand the advantage of a wraparound-style. Factor in the fit with your other sports gear. Consider a floating frame. Pay attention to altitude.

Summarize the following:
People who struggle with insecurity often feel anxious about work, school, friends, family, or their own self-image. It can seem to come out of nowhere, or it may be triggered by past negative events. Be open and willing to listen. Listen to what's bothering them. Things that seem small to you might actually be bigger, deeper issues for them. For example, if the person is worried about the shoes they're wearing, this insecurity might reflect a larger anxiety about whether they fit in with their peers. Be non-judgmental. Try to understand how they may feel, and what you might need if you were in their shoes. If they are hesitant to talk with you, consider just saying a few words to show you understand their feelings, such as "I'm sorry about what you're feeling" or "That sounds tough." While some insecure people may come off as rude or cold, avoid letting your own insecurities or judgments play out. Be kind, polite, and respectful. While it may be difficult to be this way at times, it will make it easier in the long run to deal with someone who is feeling insecure or unappreciated. Use body language that indicates you're willing to help and listen. Maintain eye contact and give your full attention. Smile and be open to talking with them about what's bothering them. If the two of you are friends, it's important to talk with them about how they're feeling. If they are acquaintances to you, consider ways to be more open and talk with them, without making them feel uncomfortable. Consider starting the conversation in a general way, but then point out something that you've noticed in them. For example, "Hey, how's it going? I noticed you didn't come to practice after school yesterday, and wondered if you're doing okay?" Be open to the fact that some people may not feel ready to talk about what's bothering them, but it's important to show that you're concerned. For example, "It looks like it's been a tough day. If you want to talk, I'm here." If you need to stop the conversation, then use polite words and say something like, "It was nice to talk with you. Okay if we catch up more tomorrow?" or "I hope you feel better. I'm free to talk more the evening, if you'd like." Sometimes, insecure people feel underappreciated or unloved. By showing an interest them, you may help them to feel better. Spend time with them one-on-one if possible. You may be able to see what's bothering them in a more real way. Insecure people are less likely to be open and honest in larger crowds. Consider asking them to do things with you and your friends. Make them feel included. Show that you care with your words and actions. Demonstrate that you are emotionally connected to their feelings and insecurities in a genuine way. Say things like, "Just know that I'm here for you and care about you" or "I know you can overcome what you're facing. You're a strong person." If this person is a close friend, family member, or partner, consider giving hugs or other forms of affection as appropriate. Only hug them after asking first and if they are open to this. Tell them it's going to be okay, and things will get better. Provide hope and motivation to succeed rather than reminding them of the bad things.
summary: Understand their perspective. Be kind and respectful. Ask them about what's bothering them. See opportunities to get to know them better. Provide reassurance and empathy.