The Denim 70's are TIM's offering in the middle-to-heavyweight opaques market. They are warm, durable, and quite comfortable. They fall short of an unqualified recommendation because of the conventional seams, and the almost total lack of 'glide' factor to the fabric; they stick to trousers like velcro! They also suffer from the TIM 'too-high' waistband.
For alternatives, consider our own L4M 820 Opaques, or the Aries Micro 60's, which are both more comfortable, and offer better value.
TIM Denim 70 Men's Opaque Tights