constructive wave: it is a low frequency and a low height wave, which leaves the material from the sea on the beach as the swash is stronger than the backwash. the cat put on a brave face and went to the castle with his boots on. this gives you a peace of mind knowing that your items are fully protected. our microscopes come with a 30 day money back guarantee. we would also take a photo of our kids playing with or wearing the items and send it with the note. it is the only thing that matters! 