You have to assemble these goggles yourself and there are no instructions included.  But I was able to find instructions online by googling ''swedish goggle assembly''.
Their simplicity is their charm.  
If you like having crystal clear lenses when your goggles are new, but hate the fact that they inevitably succumb to fogging and scratches...get these and treat them as disposables!

Ok, so I really LOVED these goggles...for 15 mins.  They are great for racing (not triathlons, competition swim meets)...not so much for endurance training.

Nothing fits better or is a more reliable goggle.

I love these goggles, I can get a tight fit around my eyes.

I feel compelled to write a review about these goggles. I have passed these up for years, because I couldn''t imagine that they would be comfortable. I am a serious lap swimmer, swimming about 3-5 days a week. I used to swear by Women''s Vanquishers, but they left terrible goggle marks, which are becoming more of a concern to me as I get older. Then I went to Kaiman Lady, which worked pretty well, but didn''t last as long and still left some suctions marks. Then I tried Barracuda standard and ultras, for the positive pressure that wasn''t supposed to leave marks, but in order to get them not to leak, they had to be uncomfortably tight, leaving marks in different areas. Finally, since they are so inexpensive, I thought I''d give these a try. It took a little time to find the right adjustment (which I did at home), but when I finally hit the pool with them, they were unbelievable!! They fit my eye sockets so gently, with very little tension in the strap, yet they didn''t leak at all! Best of all, when I finished an hour in the pool, they didn''t leave raccoon eyes! I will tell you that you have to make sure you take the time to adjust them to your face, and I took the time to file any rough edges with a nail file until it was absolutely smooth. They do fog up, but I always have Jaws Quick Spit on hand anyway, which keeps them clear for the whole workout. I liked them so much I ordered more for myself and my two sons who are competitive swimmers. I think like many other reviewers, what works for one might not work for another, but at this price, it''s worth a try. They are so uniquely adjustable. I love them!

I know some swimmers swear by these goggle but I couldn''t get them to fit correctly. Worth a try but I will be going back to my vanquishers