What is the biggest disadvantage of using a tarp for shelter?

Using a tarp for shelter primarily poses a challenge in terms of poor insulation. This characteristic is particularly significant when considering the purpose of a shelter in various weather conditions. Tarps are typically made from lightweight materials designed for portability and easy transport, which often means they do not have the insulating properties of heavier materials like tents or closed-cell foam.

Poor insulation can lead to rapid heat loss in cold environments, making a tarp less effective in retaining warmth. Additionally, in colder or wet weather, reliance on a tarp can lead to increased discomfort and exposure to the elements, which is crucial to consider in search and rescue scenarios where staying warm and dry is paramount.

While the weight of the tarp might seem like a hindrance, the benefits of a lightweight design usually outweigh this concern for many users, particularly in situations that require carrying gear over long distances. Therefore, the primary disadvantage centers around its lack of insulating capability, which can directly impact the effectiveness of the shelter in adverse conditions.