\begin{tikzpicture} \coordinate (ll) at (-3,-2); \coordinate (lr) at (3,-2); \coordinate (ul) at (-3,2); \coordinate (ur) at (3,2); \shade [shading angle=90, opacity=0.20] (ll) arc (-180:-60:3cm and .75cm) -- +(0,4) arc (-60:-180:3cm and .75cm) -- cycle; \shade [shading angle=270, opacity=0.20, color=red] (lr) arc (0:-60:3cm and .75cm) -- +(0,4) arc (-60:0:3cm and .75cm) -- cycle; \draw [thick] (ll) arc (-180:0:3cm and .75cm) -- (ur) arc (0:-180:3cm and .75cm) -- cycle; \draw [thick, shade, shading angle=30, opacity=0.90] (ul) arc (-180:180:3cm and .75cm); \node at (0,-3.5){$S^1 \times I$}; \draw[dashed] (-3,-2) arc (180:0:3cm and .75cm); \end{tikzpicture}