防晒霜防晒系数(SPF) 是不是越高越好?
防晒霜的防晒系数（Sun Protection Factor, 英文缩写SPF)是测量防晒品对阳光中紫外线的防御能力的检测指数，判断依据是皮肤的最低红斑剂量. SPF数值适用于每一个人，其计算方法是：SPF=最低红斑剂量（用防晒用品后）/最低红斑剂量（用防晒用品前). 假设紫外线的强度不会因时间改变，一个没有任何防晒措施的人如果待在阳光下20分钟后皮肤会变红，当他使用SPF15的防晒霜时，表示可延长15倍的时间，也就是在300分钟后皮肤才会被晒红, 20（分钟）*15（SPF）=300分钟 。以此类推。
SPF虽然是防晒的重要指标，但并不表示SPF值越高，保护力就越强。例如SPF15有93%的保护能力，而SPF34却只有97%的保护能力，但是，SPF值越大，其通透性越差，会妨碍皮肤的正常分泌与呼吸。SPF值越大,化学防晒剂添加的也就越多，而这类防晒剂是有腐蚀性的，添加的越多，腐蚀性也越强. .此外,由于防晒系数过高的产品， 相对而言, 质地也会比较油腻、厚重，会容易产生阻塞毛孔的现象，甚至滋生暗疮和粉刺。且一些属于化学性防晒的高系数防晒品，在经过长波紫外线的照射下，吸收热能后，多半会转换成其它物质，导致肌肤出现过敏的现象.
以东方人的肤质来说，日常防护可选用SPF10～SPF15的防晒品；如果从事游泳、打球等户外休闲活动，SPF20就足以抵抗紫外线的伤害，而不会给肌肤造成负担 . 如果去海边，阳光直射的话就选择SPF30的防晒品.
These feel great. Wore them to a rave and they did just fine.
- Liberia
Been getting these forever, love the fit, 13 4E. Perfect, comfortable.
- Switzerland
I always order these shoes for my hubby. He never wears any other shoes but Nike.
- Switzerland
Finally able to order my correct size without getting a size bigger to get the width I need.
- Switzerland
Comfortable, good sole and inner sole. Have worn this make for several years -- hope they keep making them.
- Singapore
Nike still makes a very high quality shoe. It offers excellent support and durability. This my second pair of this modal.
- Singapore
Sneakers fit as advertised; it was in excellent condition; fit was comfortable, sturdy, and it works for casual use which is what I wanted.
- Singapore
I have a wide foot and they fit well. I use it for working out, yard work and errands. I would not run in this shoe but on a stair master or bike no problem.
- Switzerland
Been wearing for 3 weeks and I am very happy with them.Have been wearing $130 shoes up to this to get good Arch support but these give almost as good at less than half the price, would buy again.
- Switzerland
I've worn Nike Air Monarch IV for years because they are so comfortable. These are excellent cross training shoes and have been ideal for my needs. It's not always easy to find them in my size, but had them at a great price!
- Singapore
2024-01-12 08:57:15--
In terms of sound quality, it's really good. The sound is very authentic, and the sound quality is somewhat unexpected. The appearance and workmanship are quite good
2024-01-12 08:55:13--
Logistics is very fast. The built-in battery capacity is very large. The headset can be used for a whole day with the charging box. There is still residual electricity. The sound effect is also very good. Extremely satisfied.
2024-01-12 08:54:07--
It has been used for several days, and it is really OK! The Bluetooth connection is stable and fast. Kaigaililian is listening to enough electricity every day. I haven't charged the charging chamber since I bought it. I feel it's worth it! The more you use, the more you like it. This headset cover is so cute! ha-ha!
2024-01-12 08:53:08--
these are exactly like the real thing. no different from the ** product. came in the ** airpod box. it was perfect
2024-01-12 08:53:04--
They’re pretty close for the price, upon opening the box, it came fully sealed with everything included in the box. The case feels quality, along with the headphones them self! Not disappointed
2024-01-12 08:52:51--
The size is a bit fair. You have to buy one more size.
The model is not the one who thought, the current one is different from this.
It has some failures but for the price it is fine.
2024-01-12 08:52:07--
Very good quality
2024-01-12 08:51:30--
The shoes are nickel I recommend and the seller and very kind (take a size below)
2024-01-12 08:50:51--
seller gave me wrong size, shoe was awful
2024-01-12 08:49:33--
awesome product!!! will buy again.
2024-01-12 08:46:29--
quick shipping good quality very satisfied
2024-01-04 19:05:18--
my husband is in love with his shoes, it look just like the pic fit perfect.
2024-01-04 19:03:40--
Our sonamp;amp;apos;s public school requires totally black or white shoes. The uniform store sells one, but not as comfort as Nike. So, this worked perfect for our very active son.
2024-01-04 19:00:18--
They are perfect
2024-01-04 18:57:06--
Not as advertised in pic. Lame shoes.
2024-01-04 18:55:06--
Shoes and box came smashed,but it isn't the venders fault, cause I see how they tried to protect them,I'm still pleased with the shoes;and I would definitely buy from them again!!!
2024-01-04 18:52:49--
They are totally cute...but LOOK MASSIVE ON MY FEET. Ladies with shoe size w11/m9.5 and up take that into consideration.
2024-01-04 18:50:44--
excellent quality 👌
2024-01-04 18:44:26--
Honestly love this shoe, i ordered a second one because the first one was perfect. I bartend so i got one for work one for pleasure. Everyone at work and even the customers compliment my shoes. The tan primeknits are perfect
2024-01-04 18:38:40--
Very good quality very real
2024-01-04 18:37:27--
good quality like usual! thank you
2024-01-04 18:37:27--
Great product! My wife was so happy!
2024-01-04 18:36:40--
Shoes are great and came with the box
2024-01-04 18:35:31--
The quality is very good, I hope more friends trust.
2024-01-04 18:35:12--
Happy with the product, quality and speed of delivery.
2024-01-04 18:34:44--
shoes have got to be real if it is stock x verfied, i love the shoes
2024-01-04 18:33:31--
Amazing! Completely like the real shoe, no glue marks, fresh clean smell. Comes with receipts and dustbag, authentication cards. The box is a bit bent but nothing major, the shoe is immaculate. Lots of room in the shoe itself so I sized down and they fit perfect.
2024-01-04 18:32:47--
Good quality, i’am satisfed
2024-01-04 09:23:45--
Awesome!!!
2024-01-04 09:20:06--
I went to compare with real. Are you sure they are not authentic? Disturbing but omg 😍😍😍
2024-01-04 09:19:41--
Shoes are good quality. I like the shoes cause they are different. But the size feel bigger than what I order. So it’s not comfortable to wear
2024-01-04 09:18:38--
I loved it so much
2024-01-04 09:18:29--
Comfortable and satisfied .
2024-01-04 09:15:27--
Watches over the Frérot pair… She is phew! 😍
2024-01-04 09:13:22--
For the most part good. It has a green/yellowish tint
2024-01-04 09:13:16--
Great shoe the only thing was the box but other than that everything is good
2024-01-04 09:13:07--
The shoe was supposed to deliver on Monday but was in Dallas for three straight days just for that i have you a 3 star for delivery.
2024-01-04 09:12:39--
Best dup ever
2024-01-04 09:12:08--
Love them they look just like the original.
2024-01-04 09:12:00--
perfect. Great material. Quality is great
2024-01-04 09:11:20--
amazing like always
2024-01-04 09:08:32--
A bag of very good quality. It looks very similar to the original. I am very satisfied!!! Received in two weeks! The materials are all very good, and the details are in place. This is definitely a high-quality purchase!!!
2024-01-04 09:08:17--
I’m very happy about this because it looks exactly like it said it would and it got here in two weeks maybe less honestly. Definitely will be buying more from this seller. Also they stay in communication with you as soon as you make the order so that was great. Overall I love it
2024-01-04 09:07:44--
My friend is going on a trip soon, so I bought him this bag. I almost kept it for myself
2024-01-04 09:06:30--
Beautiful!!😍
2024-01-04 09:01:17--
The price is cheap and the workmanship is good
2024-01-04 09:01:01--
The headphones are really great! Good sound quality!
2024-01-04 09:00:31--
Very high quality super fast shipping ... excellent seller!
2024-01-04 08:59:06--
The quality is quite good and the price is not expensive, which is quite reasonable.
2024-01-04 08:58:23--
Good sound quality, fast connection, comfortable wearing, exquisite workmanship and easy carrying.
2024-01-04 08:55:28--
After the cover is fitted, the upper cover is tight and fits seamlessly, and the cover will not fall off. I quite like it, and the hole position is also very accurate, which is very good. I will continue to buy it next time.
2024-01-04 00:06:16--
Portfolio equal to the original! Very helpful and kind seller .. great purchase !!
2024-01-04 00:03:56--
The size of this bag was smaller than expected. This is the mini Marmont, not the small Marmont. Cute bag for the price.
The black bag has a very short strap so it looks too short as a crossbody. The nude bag is good.
2024-01-04 00:03:23--
Good quality.
2024-01-04 00:01:25--
Overall the bag looks good. Has a terrible smell though. I’ve let it air out for 4 days now and it has not improved. The real bag does not have this liner so that is off, as well as the tag on the sides of the bag is missing. Very close dupe though. Print is appropriate, stitching looks good. The print is a little light, but again-for a $35 dupe, not bad. The smell is what kills you. Not sure I’ll be able to use it like this. Hopefully it goes away!
2024-01-04 00:00:56--
Not exact rep, but close.
2024-01-04 00:00:56--
Omg amazing quality 10/10 looks legit its so beautiful and has so much space
2024-01-04 00:00:29--
Love this bag. No smell, very soft material, perfect size.
2024-01-03 23:59:10--
Love love love 😍
2024-01-03 23:58:32--
Beautiful! thank you!
Displaying 1 to 60 (of 834 reviews)
