I found several search results that provide information on cologne for men, including product details, positive and negative aspects, and ingredients or materials. Here are some key takeaways from each source:

1. Earth911 provides a list of nontoxic colognes for men, including ingredients for each product. For example, Olivina Men Natural Fragrance Cologne contains scents of lemon, bergamot, and sage, and base notes of cedarwood, bourbon. The cologne is made in the USA, chemical-free, and never tested on animals.

2. FashionBeans lists the 8 best natural colognes for men that are nontoxic and organic. The article highlights Clean Classic Cool Cotton as the best overall cologne, which contains basil, ylang-ylang, galbanum, and musk. The cologne is vegan and costs less than $50.

3. Brunet provides a guide to mens fragrance, including the differences between cologne, eau de toilette, and eau de parfum. The article explains that colognes are light with 2% - 5% concentration of perfume oils and are often available in sporty scents with citrusy top notes and no base notes. They are best used post-workout or on casual weekends.

4. Sports Illustrated lists the 17 best colognes for men in 2023, including Blu Atlas Atlantis, The Dreamer by Versace, and Christian Dior Sauvage. The article provides a brief description of each cologne, including its scent and notes.

5. The Art of Manliness provides a guide to fragrance for men, including how to choose a scent, buying tips, and wearing it without being overpowering. The article suggests that a man can naturally select the cologne that works best with his natural body scent. It also recommends using the opinions of others to reinforce or question your decision.

6. Brickell Mens Products warns against toxic ingredients in cologne and suggests good ingredients to incorporate. The article explains that some of the ingredients to avoid include parabens, synthetic dyes, and synthetic fragrances. It recommends knowing yourself and avoiding any ingredients that have caused even slight reactions or irritation in the past.

Overall, it is important to choose a cologne that is nontoxic and safe for your skin. You should also consider the scent and notes of the cologne, as well as the concentration of perfume oils. Finally, it is important to be aware of any ingredients that may cause an allergic reaction or irritation.