Description Free of Bisphenol-A (BPA), phthalates, nitrosamines, lead, PVC, PET, and biologically harmful chemicals. No spill straw!! - features our cross-cut design. Extra soft, medical grade silicone straw provides easier transition from sippy cup to the next stage of feeding straw bottles. We have won multiple awards based on the ease of transition of our line. Perfect for 16 to 48 months. Comes with easy-to-close swivel top. This reduces the chance of spillage during travel and protects the straw from coming into contact with foreign substances. Dishwasher safe (top rack recommended). Base of the bottle made from ultra polished 304 stainless steel (18/8). The Thinkster of Steel and the original plastic Thinkster are almost identical in weight. Why a straw bottle? When we introduced the Thinkbaby over 8 years ago, 95% of the baby bottles on the market were made of polycarbonate, which contains BPA. Initially, we attempted to convince the major companies to move off of polycarbonate, but after being unsuccessful we launched Thinkbaby and Thinksport to address the concern of chemicals leaching from consumer products. We started with the baby bottle because polycarbonate was ubiquitous across the industry. As little ones' systems are still in a state of development, they have very little defense against foreign chemicals. While many companies have emerged to offer BPA-free baby bottles, many bottles not only still contain BPA despite saying BPA-free (see Health Canada study), but many companies have also landed on untested materials just because the material claims to be free of BPA. Thinkbaby utilizes the precautionary principle in the creation of all of our products. We don't jump to new materials without doing the requisite testing to ensure that we haven't landed on another BPA-like material. When we target a product segment that concerns us, we ask the question, “How can we make the product line safe, functional, and sustainable?” Thinkbaby and Thinksport's focus has led us to be the first company to span safe consumer products ranging from baby to adults. How is the Stainless Steel Thinkbaby Straw Bottle different? Most of the sippy cups and straw bottles on the market have hard plastic spouts or rubber spouts. We built the Thinkbaby straw bottle with a soft silicone straw. This makes it perfect for the advancement to the next stage in feeding. The straw features a cross cut design, so the Thinksters do not spill when held upside down (which obviously happens…quite often). The top of the bottle features an easy-to-close cover to keep it from coming into contact with foreign substances. The Sippy Cup and Thinkster have won numerous awards. There are also quite a few Youtube postings from parents delighted with them. The Thinkster of Steel is made from 304 stainless steel 18/8. You may notice that we do not use clear plastic windows with our products. We have found that these windows are made from PET or PVC. It doesn't make sense to t